here is a limit to the thickness of the axle; for if it bemade too small, the material of which it is made will not bearthe strain upon it, and it will break. This imperfection isobviated in thedifferential axle, the mode of action ofwhich will be sufficiently clear fromthe figure,—the string from… … 150 or THE MECHANICAL POWERS. Pa+Tc=Tb; a a 2 W 2aand the mechanical advantage =-^ = ^ , which may be increased to any extent by making the axlesJB and (7 as nearly equal as we please without unduly re-ducing the strength of the axle. 134. Again, in the case of the screw, it is obvious fromthe…
Mechanics
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