Bartlett, W. H. C. (William Holms Chambers), 1804-1893 · New York : Barnes · leaf 341
e direction of the plane isequal to the work in the vertical direction. What, then,is gained by the use of the plane? Why nothing more advantage of thethan the ability, which it gives, of putting in motion by a plane;feeble power, applied in the direction of its length, a burdenwhich the same power… … forces onelementaryportions of the surface ; such as that of aaii equally true of common road or rail-road over an undula-ting piece of ground.For, portions of theroad,as Ab, bb, bb,&c, may be taken soshort as to differ in-sensibly from a plane,in which case we shall have, by denoting the…
Mechanics · Acoustics · Optics
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