TLDR
Engines and boilers, when of small size, are now often combined in one structure which may be readily transported. Where they have a common base-plate simply, as in Fig. 114, they are called, usually, “semi-portable engines.” These little engines have some decided advantages. Being attached to one base, the combined engine and boiler is easily transported, occupies little space, and may very readily be mounted upon wheels, rendering it peculiarly well adapted for agricultural purposes.via the TL;DR App
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Written by roberthenrythurston | Robert Henry Thurston was an American engineer, and Professor of Mechanical Engineering
