Scientific American, Volume XXIV., No. 12, March 18, 1871 by Various, is part of the HackerNoon Books Series. You can jump to any chapter in this book . BOARDMAN'S COMBINED TOOL. here BOARDMAN'S COMBINED TOOL. This tool, of which our engraving is a good representation, comprises a screw wrench, a pipe wrench, a hammer, a nail claw, a screw-driver, and a bit handle, or socket wrench. The bit handle is the entire tool, the square socket or opening being made in the end of the handle, in which the shanks of bits may be inserted. The screw driver is formed on the end of the screw bar, attached to the outer jaw of the wrench, and is taken out from the hollow of the handle when required for use. The use of the other parts of the tool will be apparent from the engraving. The tool is very compact, and has this advantage over the ordinary screw wrench, that its leverage increases as it is opened to receive nuts of larger size. This invention is protected by two patents, dated respectively, May 30, 1865, and July 10, 1866. For further information address B. Boardman & Co., Norwich, Conn. 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 XXIV., No. 12, March 18, 1871. Urbana, Illinois: Project Gutenberg. Retrieved https://www.gutenberg.org/cache/epub/19180/pg19180-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 ELECTRICAL PURIFICATION OF SEWAGE AND CONTAMINATED WATER

WHEAT TESTS

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