URBIMis in the Construction Tech Industry

URBIM

Scientific American, Volume XXXVI., No. 8, February 24, 1877 by Various, is part of the HackerNoon Books Series. You can jump to any chapter in this book . The Lost Arts in New York here THE LOST ARTS IN NEW YORK. While the objects of ancient art contained in the Castellani collection, recently placed on exhibition in the Metropolitan Museum of Art in this city, are individually of great rarity and archæological value, they derive additional importance from the fact that, viewed conjunctively as a collection, they represent connected histories of two great industrial arts extending over many centuries. Both in the work of the goldsmith and of the potter, we are enabled to trace progress from the earliest stages up to a period when the greatest skill was attained, and even subsequently into the era of decadence. In both industries, we find that ancient and mediæval workmen possessed knowledge which we do not possess; and among Signor Castellani's treasures may be seen handiwork which is the embodiment of two lost arts, the secrets of which the modern world, with all its infinitely superior wisdom, has not yet rediscovered. The productions, in the Castellani collection, of precious metal workers dating from prehistoric epochs, the exact dates of which are wholly unknown, and covering the long period ending in the thirteenth century, are represented by the contents of some twenty cases. The first three of these receptacles bear no dates. The ornaments which they contain are of bronze, amber, silver, and glass (the latter having become converted into opalescent silicic acid), and were found in Præneste (modern Palestrina, Italy), and in the territory which was ancient Etruria. Case No. 4 bears date 700 B.C., and here is a rich treasure of primitive Etruscan and Phœnician ornaments of gold, adorned with granulated work. Signor Castellani considers that the workmanship of these objects is so perfect that it is impossible at the present time to explain the process of execution, and very difficult to imitate it. The ornaments are of two kinds—those for ordinary use and those for funereal purposes. The first are massive, and might be worn for years without injury; the others are extremely delicate. All are made of the purest gold, and their decoration evinces the most consummate skill and taste on the part of the artist. There is, for example, a small flask, shaped something like an antique wine jar, and about five inches in height. It is of beaten gold, and is covered with a pattern intended to imitate the similarly shaped designs of variegated glass of the Græco-Phœnician period. This pattern is entirely produced by minute globules of metal soldered to the surface in tiers of zigzag or Vandyke patterns. Another specimen is a strip of gold covered with granulated lines and bearing a row of birds in relief. On other ornaments are exquisitely carved heads and flowers, produced apparently by hammering on the reverse of the object, but with a delicacy and precision of touch which is simply marvelous. The closest students of this ancient handiwork are entirely at a loss to understand how the processes of melting, soldering, and wire drawing, which were employed in the art, were performed. Modern workmen have failed in their attempts exactly to imitate the old ornaments; and it is certain that the secret of the mechanical agents, whereby it was possible to separate and join pieces of gold hardly perceptible to the naked eye, is lost. Signor Castellani has taken great pains to solve the problem, reading all the treatises of mediæval goldsmiths, inquiring of all classes of Italian jewelers, and experimenting with all kinds of chemicals, in the hope of finding the solder wherewith the minute grains were attached to the surface of the metal. At last he found some of the old processes still employed in a remote district, hidden in the recesses of the Apennines, far from the great towns. Bringing away a few workmen, he gave them much more instruction, and at last succeeded, not perhaps in equalling, but certainly in rivalling the ancient productions. We question whether the Etruscans used fire at all in their soldering, as it would be almost an impossibility to keep the excessively fine tools necessary for the work at a proper heat. Mr. Joshua Rose offers the plausible suggestion that a cold flux was employed, with which the workman followed the lines or dots of his pattern. Then the gold granules were possibly sprinkled over the surface, and adhered only to the solder, the superfluous grains being brushed off after the solder had set. There is also a fragment of a finely woven fabric, made of threads of pure gold, found on the body of a woman in a tomb at Metapontum. This is without doubt the material to which the Psalmist refers in speaking of "the King's daughter" having "clothing of wrought gold;" and in the Pentateuch there is reference to gold threads being used upon looms. As we follow the various objects in the twenty cases above mentioned, the decline of the goldworker's art when the use of enamels came into vogue is evidenced. Continuing on to later periods, the decadence is more marked under the successors of Alexander. In Rome, under the emperors, we find gold used as a mere setting for precious stones, and finally the collection terminates with examples of workmanship of the time of Charlemagne, when the workmen had lost their cunning, and the noble metal had been altogether debased to secondary uses. The second instance where a lost art is exemplified in Signor Castellani's collection is in the glazing of the Gubbio majolica. We have not space here to review the magnificent series of ancient specimens of pottery in detail; and thus it will suffice to say that, beginning with some of the earliest pieces made by the Arabs when they occupied Sicily, from the twelfth to the sixteenth century, the collection presents examples of all the finest types of later mediæval art. Gubbio, where the peculiar kind of majolica above noted was made, is a small town once in the territory of the dukes of Urbino; and in the sixteenth century it became famous for its pottery. This was attributable to the talent of one man, Giorgio Andreoli, who is reputed to have invented the wonderful luster characteristic of the Gubbio ware. The body of majolica is mere common clay; and after the piece is finished on the wheel, it is dried and burnt in a furnace. After the biscuit thus prepared has been dipped in the glaze, the colors are applied on the soft surface of the latter, and the vitrifying process fuses all into a glossy enamel of the color of the pigment. This is still the common practice; and we mention it merely to show that to his pigment and glaze Andreoli must have added some third substance, which rendered the enamel capable of reflecting white light as blue, red, green, or yellow light—in other words, of giving the object a luster of a color wholly different from the tints of the pigment. He evidently could produce any desired color at will, and the effects gained are indescribably beautiful. The Castellani collection contains 130 superb specimens, which glow like jewels. In one, the scene of the nativity of Christ is provided with the figures in low relief, and the exquisite cerulean lustre is imparted to give the effect of moonlight. The rarest pieces are those of which the luster is a delicate green. Some blaze with yellow, as if of gold; others exhibit the brilliancy of the ruby; while others resemble the interior of the pearl oyster shell. Whether this sheen is produced by polarization of the light in some manner, or whether it is at all analogous to fluorescence, is yet to be decided. The impression of the surface with fine microscopic lines might produce an iridescence, but not separate and clearly defined hues. The ware was intended for ornamental purposes, not for household use; and it was suspended against the rich, dark tapestries of the period with which walls were covered, thus aiding, as it were, in illuminating the apartment with its exquisite radiance. About HackerNoon Book Series: We bring you the most important technical, scientific, and insightful public domain books. This book is part of the public domain. Various (2006). Scientific American, Volume XXXVI., No. 8, February 24, 1877. Urbana, Illinois: Project Gutenberg. Retrieved https://www.gutenberg.org/cache/epub/19406/pg19406-images.html This eBook is for the use of anyone anywhere at no cost and with almost no restrictions whatsoever. You may copy it, give it away or re-use it under the terms of the Project Gutenberg License included with this eBook or online at , located at www.gutenberg.org https://www.gutenberg.org/policy/license.html

THE LOST ARTS IN NEW YORK

Philochristus: Memoirs of a Disciple of the Lord by Edwin Abbott Abbott is part of the HackerNoon Books Series. You can jump to any chapter in this book . Of the doctrine of John the Prophet, how it suited with the people of the land; and how I was baptized of the Prophet. here Of the doctrine of John the Prophet, how it suited with the people of the land; and how I was baptized of the Prophet. As we drew near to Bethany, we noted many hundreds of travellers on the road, the most part on foot, but many on asses and camels; for rich as well as poor were journeying to the new prophet. A full score of Scribes went past us in the space of an hour; there were also some soldiers going to Machærus; here and there was a tax-gatherer; and Baruch took note of certain that were sinners, outcasts from the synagogue of Capernaum. We had now been journeying for a day and a half; and toward the end of the second day, we began to see the valley of Jordan right over against us. Going down a little further, we perceived that there was a great multitude gathered together near the bank of the river; and presently we could clearly discern the prophet himself. Around him stood men in white garments awaiting purification; at a somewhat greater distance, the mixed multitude hearkening to his words. John himself, wearing no tunic, but clad only in a rough mantle of camel’s hair with a girdle of untanned leather, was sitting upon a rock, and thence he was speaking to the people in a clear voice, whereof the sound (though not as yet the meaning) was borne up even to our ears. For a while we stood still, with one consent, marvelling at the sight; for there had not been a prophet in Israel for four hundred years and more; but presently, riding down with all speed, we came into the valley, and joined ourselves to the multitude: and, albeit, we could not come very nigh to John, for the press, yet was there such a stillness among all the assembly, that we very soon understood whatsoever he said. He had been speaking (this I learned afterwards from one of the bystanders) concerning the old wars and troubles which the Lord had sent on Israel; how, according to the saying of the Prophet Isaiah, the Lord had brought the Assyrian against the land as an axe, whereby He had cut down our chosen nobles and princes, even as a woodman felleth the choicest trees. Also how, in the days of the Prophet Jeremiah, the Lord had sent the blast of His wrath upon the people, and had winnowed away the unstable and faithless into captivity, even as a winnower fanneth the chaff from the wheat. The same things were at hand even now, he said: “Now also the axe is laid at the root of the trees; therefore every tree which bringeth not forth good fruit is hewn down and cast into the fire.” Hereat the multitude cried aloud, saying that it was even so; for indeed we all felt in our hearts that the prophet spake the truth. As the Assyrian axe in the days of old, so now the Roman axe was laid at the root of Israel; and unless the Lord turned away His wrath from us, the nation would be destroyed. But then a stillness fell upon the multitude, as we waited till the prophet should tell us what we should do to turn away the Lord’s wrath. Then the prophet set his face toward the men in white garments, and said to them that they should cleanse their hearts and not their bodies merely, and put away the iniquity of their souls, and he called upon them to confess their sins. He bade them also not to trust in their being children of Abraham, nor in the purifications of the Law, nor in the observances of Sabbaths and feast-days. If, said he, the tree was to escape the axe, it must no longer be barren: “bring forth fruits therefore worthy of repentance, and think not to say within yourselves, We have Abraham to our father, for I say unto you that God is able of these stones to raise up children unto Abraham.” Saying these words, he beckoned to the men in white robes that they should follow him. The multitude made way for them; and he led them down to a place by the side of the river where the reeds and thickets of willow-beds had been rooted up, so that there might be free passage into the water. Then he cried in a clear voice, “Receive the baptism of Repentance,” and bade them plunge themselves beneath the surface. At the same time he offered up prayers to God; and we upon the higher bank said, Amen. When he had made an end of baptizing the men, he went up again to the rock, and thence he again spoke to the people; and as many as desired purification went up to him there. Now while the people were going up by courses, I also began to resolve in my heart that I too would go up in the order of my course. Yet had I sore misgivings in my soul; for it seemed as if I were on the verge of a great sea, launching out into the deep I knew not whither. For the teaching of this new prophet in no wise agreed with the teaching of the Scribes and Lawyers, whom I had reverenced; and if I went with him, I perceived that I must needs go away from them. Now it came to pass that a certain Scribe (who was with our company) perceived the reasonings of my heart, and that I was desirous to receive purification at the hands of John. Therefore he took me by the cloak, and held me back, saying, “Behold, if John the son of Zachariah speaketh well, the Scribes have spoken ill, and have taught ill. Yea, and all thy study of the Law, and thy painful meditations therein, and thy nightly watchings and weariness of the flesh have all been in vain. But wilt thou lightly forsake the teaching of the Law and the Traditions of the Fathers, and all for the sake of one new prophet, concerning whom thou knowest not as yet even that he is a prophet? And wherefore shouldst thou thus seek after prophets? Knowest thou not that the Inscrutable (blessed be He) decreed that, after the destruction of the first Temple, there should be no longer with us the Shekinah, nor the Holy Spirit, nor the Urim and Thummim; wherefore it is said, ‘From the fourth year of King Darius, the Holy Spirit no longer rested upon the prophets.’ But in the place of the prophets (who were not always with Israel) thou hast now the Scribes always with thee, according as it is said, ‘Moses received the Law from Sinai, and the elders delivered it to the prophets, and the prophets to the men of the Great Congregation;’ and it is also said, ‘from the time that the Temple was destroyed, the gift of prophecy was taken from the prophets and given to the Wise.’ ” His words moved me, and I restrained myself for the time. Yet on the other side there rose in my heart a certain Voice, which seemed to come from the Lord, saying, “The words of John are right, and they are simple, converting the soul. Moreover, they are fit for the people of the land, and not only for Scribes and scholars and pedants. But that he is a prophet, thine own heart convinceth thee; for even when thou hearest him, thou knowest that he speaketh not from himself, but that he is taught from above. And did not also the prophets of old speak like things, saying, ‘Rend your hearts, and not your garments,’ and bidding Israel not to offer sacrifice, but to shew mercy, and not to observe Sabbaths, but to do judgment and relieve the oppressed?” So between the words of the Scribe and the words of the Voice within me I was in a great strait. Howbeit for the time I restrained myself and did nothing, but remained where I was, giving heed to the words of the Prophet. Now it came to pass that certain of the soldiers from Machærus went up: and all we in the crowd waited silently expecting that the Prophet would deny purification to these men, except they should first promise to depart from the army of Herod. But he commanded them only to abstain from robbery and outrage. Upon this certain tax-gatherers (whom the Romans call publicans) took confidence, and they too went up. And now indeed all we that looked on, expected that there should have been a great outburst of wrath and of cursing upon them, as upon traitors and apostates from Israel. But the Prophet received these also, and bade them exact no more than that which was appointed to them. To others he said that they were to observe that saying in the Traditions which enjoineth the doing of kindnesses; that is to say, they were to clothe the naked and to feed the hungry, and the like. Hereupon arose a murmuring among certain of the Scribes from Jerusalem, who were standing nigh to the place where I was: and I heard the voice of Hezekiah son of Zachariah saying in an austere manner, “It is said, ‘On three things the world is stayed; on the Law, and on the Worship, and on the bestowal of Kindnesses:’ what meaneth this teacher of strange things therefore, to subvert the Law and the Worship, in that he maketh no mention thereof, but he exalteth Kindnesses to the skies?” Then another said, “He allegeth the authority of no teacher; why therefore hearken we to him?” But a third said, “Peradventure he is a prophet, and is taught of God.” But Hezekiah made answer, “The time of prophets hath passed. Besides, he hath wrought no sign from Heaven; how know we therefore that he is a true prophet?” These things spake the Scribes together, as we went back from the river to the place where our tents were pitched; for by this time the sun was setting. But all that night long my thoughts still beat on the doctrine of John; and I marvelled much whence it came that the people so flocked to John as to a prophet; yea, and that my own heart also was so drawn towards him, although he had wrought no sign in heaven, nor so much as driven out any unclean spirit. But the reason seemed to me partly in himself. For his very countenance, yea, even his gesture and carriage, proclaimed him to be, not a student of books, but one that was taught of God; and yet further the hardships that he endured, and the manner of his clothing and food (for he fed on nothing but locusts and wild honey) shewed to all men that he did not prophesy for gain. But another reason lay in his doctrine. For the doctrine of John was simple and just, commending itself to the consciences of men; not flattering any nor busying itself with abstruse matters; but fit for the work of life and the paths of busy men, able, as it seemed, to carry purity and righteousness even to the side of the plough, and into the ranks of armed men, and into the shops and offices of tradesmen and tax-gatherers. For this cause the teaching of John won a way into the hearts of men of every degree, save only certain of the Pharisees. So when I thought on all these things, I began to be convinced that he was sent of God. But when I went forth on the morrow to behold the purification of the disciples and to hear the teaching of the Prophet, my heart was even more drawn unto him. For I compared him with Abuyah the son of Elishah, and with the ruler of the synagogue, that had driven away the tax-gatherers and sinners from the teaching of repentance; and it seemed to me that John was as much better than they, as light is better than darkness. For though he were of a stern countenance and austere in aspect, yet was the austerity of John in no wise as the austerity of Abuyah the son of Elishah. For Abuyah was sour and peevish, for that he ever loved to find fault, and because he desired to obtain occasion for rebuking, to the intent that he might persuade himself that he was better than others: but John seemed to be austere only because he hated sin. So I no more delayed, but went up with the rest, about the second hour of the day; and I confessed my sins and received purification. After we had been purified, I stood with the rest, clothed in white garments, wholly given up to meditating upon the new life whereto we seemed to have risen out of the waters. But I was aroused by hearing these words spoken with a great vehemency of anger: “Ye serpents, ye generation of vipers, who hath warned you to flee from the wrath to come?” Great indeed was my astonishment when, raising myself to see what they were to whom the Prophet was thus speaking, I discerned the faces of some of the most famous Scribes in Jerusalem. It seemed that they had been questioning him who he was and by what authority he taught these things. But the Prophet rebuked them with exceeding indignation. For he said that they were even as barren trees, full of leaf, but bearing no fruit, fit for naught but to be cut down and cast into the fire. Then they went backward, being put to utter confusion; but John turned to us that had been purified, and spake to us a second time as follows: “I am not the Christ. Call not yourselves my disciples: for I myself am naught but a herald in the wilderness preparing the way for the Great King. But verily the King cometh. Therefore weep no more for the evils of sin. The rough ways of oppression shall be made smooth; the crooked paths of deceit and violence shall be made straight. Let the daughter of Jerusalem rejoice greatly, for her salvation is nigh. For the glory of the Lord draweth near, and all flesh shall see it together. Notwithstanding think not of me as your deliverer. He that hath the bride is the bridegroom, and the Bridegroom of Sion is the Redeemer, who shall espouse her in the day of salvation. I am but the friend of the Bridegroom. Nay, I am but his servant, not worthy to follow him as slave, nor to loose the latchet of his sandal. Ye ask in your hearts who I am. But think not of me, for I am as one that is no man. I am naught but a voice, even the voice of one crying in the wilderness, ‘Prepare ye the way of the Lord, make His paths straight.’ ” Then he warned us that had been purified not to suppose that we needed no further purification. Speaking of the old days of Joshua the Conqueror, he brought to our minds how our fathers had two kinds of purification; one inferior, with water, wherewith they purified things perishable, such as garments and the like; but a more searching purification, wherewith they purified silver and gold and other imperishable things, and this was with fire. Even so, he said, it was given to him to purify only with the washing of water; but one would come after him, the Messiah and Redeemer; and he would purify us with fire and with the Holy Spirit. In the evening, when we, that had received the purification, conversed together in the inn at Jericho, there was much questioning whence the Messiah should come, and by what signs he should be known. But most of the Scribes did not believe that John was a true prophet; and Hezekiah protested that he ought not to be called a prophet, for he had wrought no sign, not even on earth, much less in heaven. But this he said not openly, for fear of the multitude; for almost all believed John to be a prophet. But on the morrow, when we turned ourselves to go northward, heaviness fell upon my heart, and all things seemed flat and unprofitable. All our counsels of action, whether to join ourselves to the army of Herod, or straightway to rise up against the Romans, behold, they now seemed no longer the wisdom of men, but rather the vain talk of children. For what could Barabbas and the sons of Judas do, in comparison with the true Redemption which had been prophesied by the Prophet; or how could they avail to bring about the day of that Redemption? It seemed to be our wisdom to wait for the Lord, who alone could send the true Redeemer. And yet, on the other hand, how was it possible for one that loved Israel and longed after righteousness, to look patiently upon the servitude of his country? Hence I loathed the thought of living in peace at home. When I returned to Sepphoris, I applied myself to labour and to study, if perchance I might settle my thoughts; but I could not, for I was divided between two minds. At one time I was minded to obey John and his teaching, and to set no store on the teaching of the Scribes, nor to give heed to what were called the “light precepts” of the Fathers, such as those concerning tassels and fringes, and the purification of vessels, and the observance of the Sabbath for things without life, and the like; and it seemed nobler to cast these things away, and to say that mercy, and judgment, and truth, and kindness, were the great commandments, and whoso observeth these, observeth all. But then at other times, when I considered with myself how frail and fitful a thing is man, how impotent for all good ends, and how easily led aside from the right path by passion and by ignorance, then I trembled at the thought of casting down the fences which had been raised by the generations of the wise; for I feared lest I should be guilty of presumption, and should fall, and be swallowed up with an utter destruction. But in the minds of other men (and not in me alone) there was at this time much unsettlement and many searchings of heart. For many others in Sepphoris became ill-content with the teaching of the Scribes, and with the performance of the precepts of the Law. Some men even said that, when the Messiah came, there should be no more Law. So, if, even before, men had been expecting the Messiah and looking forward to the Redemption of Sion, much more did they do so now, after the preaching of John the Prophet; insomuch that the whole of Galilee became as dry fuel ready for the flame: and nothing was wanting save a spark of fire from heaven to kindle the whole into a great blaze. By this time I had numbered thirty-four years, or something more; and it was the fourteenth year of the Emperor Tiberius. About HackerNoon Book Series: We bring you the most important technical, scientific, and insightful public domain books. This book is part of the public domain. Edwin Abbott Abbott (2015). Philochristus: Memoirs of a Disciple of the Lord. Urbana, Illinois: Project Gutenberg. Retrieved https://www.gutenberg.org/cache/epub/48843/pg48843-images.html This eBook is for the use of anyone anywhere at no cost and with almost no restrictions whatsoever. You may copy it, give it away or re-use it under the terms of the Project Gutenberg License included with this eBook or online at , located at . www.gutenberg.org https://www.gutenberg.org/policy/license.html

Of the doctrine of John the Prophet, how it suited with the people of the land;

Topographical Notes

The Notebooks of Leonardo Da Vinci — Complete by Leonardo da Vinci, is part of the HackerNoon Books Series. You can jump to any chapter in this book here . PERSPECTIVE OF COLOUR AND AERIAL PERSPECTIVE Chapter VI. ﻿PERSPECTIVE OF COLOUR AND AERIAL PERSPECTIVE Leonardo distinctly separates these branches of his subject, as may be seen in the beginning of No. 295. Attempts have been made to cast doubts on the results which Leonardo arrived at by experiment on the perspective of colour, but not with justice, as may be seen from the original text of section 294. The question as to the composition of the atmosphere, which is inseparable from a discussion on Aerial Perspective, forms a separate theory which is treated at considerable length. Indeed the author enters into it so fully that we cannot escape the conviction that he must have dwelt with particular pleasure on this part of his subject, and that he attached great importance to giving it a character of general applicability. General rules (289—291). 289. The variety of colour in objects cannot be discerned at a great distance, excepting in those parts which are directly lighted up by the solar rays. 290. As to the colours of objects: at long distances no difference is perceptible in the parts in shadow. 291. OF THE VISIBILITY OF COLOURS. Which colour strikes most? An object at a distance is most conspicuous, when it is lightest, and the darkest is least visible. An exceptional case. 292. Of the edges [outlines] of shadows. Some have misty and ill defined edges, others distinct ones. No opaque body can be devoid of light and shade, except it is in a mist, on ground covered with snow, or when snow is falling on the open country which has no light on it and is surrounded with darkness. And this occurs [only] in spherical bodies, because in other bodies which have limbs and parts, those sides of limbs which face each other reflect on each other the accidental [hue and tone] of their surface. An experiment. 293. ALL COLOURS ARE AT A DISTANCE UNDISTINGUISHABLE AND UNDISCERNIBLE. All colours at a distance are undistinguishable in shadow, because an object which is not in the highest light is incapable of transmitting its image to the eye through an atmosphere more luminous than itself; since the lesser brightness must be absorbed by the greater. For instance: We, in a house, can see that all the colours on the surface of the walls are clearly and instantly visible when the windows of the house are open; but if we were to go out of the house and look in at the windows from a little distance to see the paintings on those walls, instead of the paintings we should see an uniform deep and colourless shadow. The practice of the prospettiva de colori. 294. HOW A PAINTER SHOULD CARRY OUT THE PERSPECTIVE OF COLOUR IN PRACTICE. In order to put into practice this perspective of the variation and loss or diminution of the essential character of colours, observe at every hundred braccia some objects standing in the landscape, such as trees, houses, men and particular places. Then in front of the first tree have a very steady plate of glass and keep your eye very steady, and then, on this plate of glass, draw a tree, tracing it over the form of that tree. Then move it on one side so far as that the real tree is close by the side of the tree you have drawn; then colour your drawing in such a way as that in colour and form the two may be alike, and that both, if you close one eye, seem to be painted on the glass and at the same distance. Then, by the same method, represent a second tree, and a third, with a distance of a hundred braccia between each. And these will serve as a standard and guide whenever you work on your own pictures, wherever they may apply, and will enable you to give due distance in those works. [14] But I have found that as a rule the second is 4/5 of the first when it is 20 braccia beyond it. [Footnote: This chapter is one of those copied in the Manuscript of the Vatican library Urbinas 1270, and the original text is rendered here with no other alterations, but in the orthography. H. LUDWIG, in his edition of this copy translates lines 14 and 15 thus: "Ich finde aber als Regel, dass der zweite um vier Funftel des ersten abnimmt, wenn er namlich zwanzig Ellen vom ersten entfernt ist (?)". He adds in his commentary: "Das Ende der Nummer ist wohl jedenfalls verstummelt". However the translation given above shows that it admits of a different rendering.] The rules of aerial perspective (295—297). 295. OF AERIAL PERSPECTIVE. There is another kind of perspective which I call Aerial Perspective, because by the atmosphere we are able to distinguish the variations in distance of different buildings, which appear placed on a single line; as, for instance, when we see several buildings beyond a wall, all of which, as they appear above the top of the wall, look of the same size, while you wish to represent them in a picture as more remote one than another and to give the effect of a somewhat dense atmosphere. You know that in an atmosphere of equal density the remotest objects seen through it, as mountains, in consequence of the great quantity of atmosphere between your eye and them—appear blue and almost of the same hue as the atmosphere itself [Footnote 10: quado il sole e per leuante (when the sun is in the East). Apparently the author refers here to morning light in general. H. LUDWIG however translates this passage from the Vatican copy "wenn namlich die Sonne (dahinter) im Osten steht".] when the sun is in the East [Footnote 11: See Footnote 10]. Hence you must make the nearest building above the wall of its real colour, but the more distant ones make less defined and bluer. Those you wish should look farthest away you must make proportionately bluer; thus, if one is to be five times as distant, make it five times bluer. And by this rule the buildings which above a [given] line appear of the same size, will plainly be distinguished as to which are the more remote and which larger than the others. 296. The medium lying between the eye and the object seen, tinges that object with its colour, as the blueness of the atmosphere makes the distant mountains appear blue and red glass makes objects seen beyond it, look red. The light shed round them by the stars is obscured by the darkness of the night which lies between the eye and the radiant light of the stars. 297. Take care that the perspective of colour does not disagree with the size of your objects, hat is to say: that the colours diminish from their natural [vividness] in proportion as the objects at various distances dimmish from their natural size. On the relative density of the atmosphere (298—290). 298. WHY THE ATMOSPHERE MUST BE REPRESENTED AS PALER TOWARDS THE LOWER PORTION. Because the atmosphere is dense near the earth, and the higher it is the rarer it becomes. When the sun is in the East if you look towards the West and a little way to the South and North, you will see that this dense atmosphere receives more light from the sun than the rarer; because the rays meet with greater resistance. And if the sky, as you see it, ends on a low plain, that lowest portion of the sky will be seen through a denser and whiter atmosphere, which will weaken its true colour as seen through that medium, and there the sky will look whiter than it is above you, where the line of sight travels through a smaller space of air charged with heavy vapour. And if you turn to the East, the atmosphere will appear darker as you look lower down because the luminous rays pass less freely through the lower atmosphere. 299. OF THE MODE OF TREATING REMOTE OBJECTS IN PAINTING. It is easy to perceive that the atmosphere which lies closest to the level ground is denser than the rest, and that where it is higher up, it is rarer and more transparent. The lower portions of large and lofty objects which are at a distance are not much seen, because you see them along a line which passes through a denser and thicker section of the atmosphere. The summits of such heights are seen along a line which, though it starts from your eye in a dense atmosphere, still, as it ends at the top of those lofty objects, ceases in a much rarer atmosphere than exists at their base; for this reason the farther this line extends from your eye, from point to point the atmosphere becomes more and more rare. Hence, O Painter! when you represent mountains, see that from hill to hill the bases are paler than the summits, and in proportion as they recede beyond each other make the bases paler than the summits; while, the higher they are the more you must show of their true form and colour. On the colour of the atmosphere (300-307). 300. OF THE COLOUR OF THE ATMOSPHERE. I say that the blueness we see in the atmosphere is not intrinsic colour, but is caused by warm vapour evaporated in minute and insensible atoms on which the solar rays fall, rendering them luminous against the infinite darkness of the fiery sphere which lies beyond and includes it. And this may be seen, as I saw it by any one going up [Footnote 5: With regard to the place spoken of as M'oboso (compare No. 301 line 20) its identity will be discussed under Leonardo's Topographical notes in Vol. II.] Monboso, a peak of the Alps which divide France from Italy. The base of this mountain gives birth to the four rivers which flow in four different directions through the whole of Europe. And no mountain has its base at so great a height as this, which lifts itself almost above the clouds; and snow seldom falls there, but only hail in the summer, when the clouds are highest. And this hail lies [unmelted] there, so that if it were not for the absorption of the rising and falling clouds, which does not happen twice in an age, an enormous mass of ice would be piled up there by the hail, and in the middle of July I found it very considerable. There I saw above me the dark sky, and the sun as it fell on the mountain was far brighter here than in the plains below, because a smaller extent of atmosphere lay between the summit of the mountain and the sun. Again as an illustration of the colour of the atmosphere I will mention the smoke of old and dry wood, which, as it comes out of a chimney, appears to turn very blue, when seen between the eye and the dark distance. But as it rises, and comes between the eye and the bright atmosphere, it at once shows of an ashy grey colour; and this happens because it no longer has darkness beyond it, but this bright and luminous space. If the smoke is from young, green wood, it will not appear blue, because, not being transparent and being full of superabundant moisture, it has the effect of condensed clouds which take distinct lights and shadows like a solid body. The same occurs with the atmosphere, which, when overcharged with moisture appears white, and the small amount of heated moisture makes it dark, of a dark blue colour; and this will suffice us so far as concerns the colour of the atmosphere; though it might be added that, if this transparent blue were the natural colour of the atmosphere, it would follow that wherever a larger mass air intervened between the eye and the element of fire, the azure colour would be more intense; as we see in blue glass and in sapphires, which are darker in proportion as they are larger. But the atmosphere in such circumstances behaves in an opposite manner, inasmuch as where a greater quantity of it lies between the eye and the sphere of fire, it is seen much whiter. This occurs towards the horizon. And the less the extent of atmosphere between the eye and the sphere of fire, the deeper is the blue colour, as may be seen even on low plains. Hence it follows, as I say, that the atmosphere assumes this azure hue by reason of the particles of moisture which catch the rays of the sun. Again, we may note the difference in particles of dust, or particles of smoke, in the sun beams admitted through holes into a dark chamber, when the former will look ash grey and the thin smoke will appear of a most beautiful blue; and it may be seen again in in the dark shadows of distant mountains when the air between the eye and those shadows will look very blue, though the brightest parts of those mountains will not differ much from their true colour. But if any one wishes for a final proof let him paint a board with various colours, among them an intense black; and over all let him lay a very thin and transparent [coating of] white. He will then see that this transparent white will nowhere show a more beautiful blue than over the black—but it must be very thin and finely ground. [Footnote 7: reta here has the sense of malanno.] 301. Experience shows us that the air must have darkness beyond it and yet it appears blue. If you produce a small quantity of smoke from dry wood and the rays of the sun fall on this smoke, and if you then place behind the smoke a piece of black velvet on which the sun does not shine, you will see that all the smoke which is between the eye and the black stuff will appear of a beautiful blue colour. And if instead of the velvet you place a white cloth smoke, that is too thick smoke, hinders, and too thin smoke does not produce, the perfection of this blue colour. Hence a moderate amount of smoke produces the finest blue. Water violently ejected in a fine spray and in a dark chamber where the sun beams are admitted produces these blue rays and the more vividly if it is distilled water, and thin smoke looks blue. This I mention in order to show that the blueness of the atmosphere is caused by the darkness beyond it, and these instances are given for those who cannot confirm my experience on Monboso. 302. When the smoke from dry wood is seen between the eye of the spectator and some dark space [or object], it will look blue. Thus the sky looks blue by reason of the darkness beyond it. And if you look towards the horizon of the sky, you will see the atmosphere is not blue, and this is caused by its density. And thus at each degree, as you raise your eyes above the horizon up to the sky over your head, you will see the atmosphere look darker [blue] and this is because a smaller density of air lies between your eye and the [outer] darkness. And if you go to the top of a high mountain the sky will look proportionately darker above you as the atmosphere becomes rarer between you and the [outer] darkness; and this will be more visible at each degree of increasing height till at last we should find darkness. That smoke will look bluest which rises from the driest wood and which is nearest to the fire and is seen against the darkest background, and with the sunlight upon it. 303. A dark object will appear bluest in proportion as it has a greater mass of luminous atmosphere between it and the eye. As may be seen in the colour of the sky. 304. The atmosphere is blue by reason of the darkness above it because black and white make blue. 305. In the morning the mist is denser above than below, because the sun draws it upwards; hence tall buildings, even if the summit is at the same distance as the base have the summit invisible. Therefore, also, the sky looks darkest [in colour] overhead, and towards the horizon it is not blue but rather between smoke and dust colour. The atmosphere, when full of mist, is quite devoid of blueness, and only appears of the colour of clouds, which shine white when the weather is fine. And the more you turn to the west the darker it will be, and the brighter as you look to the east. And the verdure of the fields is bluish in a thin mist, but grows grey in a dense one. The buildings in the west will only show their illuminated side, where the sun shines, and the mist hides the rest. When the sun rises and chases away the haze, the hills on the side where it lifts begin to grow clearer, and look blue, and seem to smoke with the vanishing mists; and the buildings reveal their lights and shadows; through the thinner vapour they show only their lights and through the thicker air nothing at all. This is when the movement of the mist makes it part horizontally, and then the edges of the mist will be indistinct against the blue of the sky, and towards the earth it will look almost like dust blown up. In proportion as the atmosphere is dense the buildings of a city and the trees in a landscape will look fewer, because only the tallest and largest will be seen. Darkness affects every thing with its hue, and the more an object differs from darkness, the more we see its real and natural colour. The mountains will look few, because only those will be seen which are farthest apart; since, at such a distance, the density increases to such a degree that it causes a brightness by which the darkness of the hills becomes divided and vanishes indeed towards the top. There is less [mist] between lower and nearer hills and yet little is to be distinguished, and least towards the bottom. 306. The surface of an object partakes of the colour of the light which illuminates it; and of the colour of the atmosphere which lies between the eye and that object, that is of the colour of the transparent medium lying between the object and the eye; and among colours of a similar character the second will be of the same tone as the first, and this is caused by the increased thickness of the colour of the medium lying between the object and the eye. 307. OF PAINTING. Of various colours which are none of them blue that which at a great distance will look bluest is the nearest to black; and so, conversely, the colour which is least like black will at a great distance best preserve its own colour. Hence the green of fields will assume a bluer hue than yellow or white will, and conversely yellow or white will change less than green, and red still less. About HackerNoon Book Series: We bring you the most important technical, scientific, and insightful public domain books. This book is part of the public domain. Leonardo da Vinci (2004). The Notebooks of Leonardo Da Vinci — Complete. Urbana, Illinois: Project Gutenberg. Retrieved https://www.gutenberg.org/cache/epub/5000/pg5000.html This eBook is for the use of anyone anywhere at no cost and with almost no restrictions whatsoever. You may copy it, give it away or re-use it under the terms of the Project Gutenberg License included with this eBook or online at www.gutenberg.org , located at https://www.gutenberg.org/policy/license.html .

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