sider that the pressure is in the direction of the normalto the curve; and when resting on a plane, the pressure isperpendicular to the plane. We may observe here, that in treating statical problemswhich involve more than one body, we usually consider whataction and reaction will exist between the… … ON THE MECHANICAL POWERS. The Mechanical Powers are the elementary forms of allmachines, and may be considered as simple devices forenabling a smaller force, usually called the Power (P), to bein equilibrium with a larger force, usually called the Weight 224 STATICS. (W). They may be thus…
