Chatur Ramalingam aka 'Silencer': Sir: Machines are any combination of bodies so connected that their relative motions are constrained, and by which means force and motion may be transmitted and modified, as a screw and its nut, or a lever arranged to turn about a fulcrum or a pulley about its pivot, et cetera; especially, a construction, more or less complex, consisting of a combination of moving parts or simple mechanical elements, as wheels, levers, cams et cetera.