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On the application of the simplest of these, Mechanics, depends the success of modern manufactures. The properties of the lever, the wheel-and-axle, etc., are recognised in every machine, and to machinery in these times we owe all production. Trace the history of the breakfast-roll.
But had it no other purpose? That question we may answer when we know its name and its nature. And it is not beyond our powers to conjecture this with something like certainty. For the only "machines" possible to use in illustration of simple mechanics are the screw, the wedge, the scale, the lever, the wheel-and-axle, and Atwood's machine.
I cannot say that he had yet come to understand the mechanical power so thoroughly as to see that the lever and the wheel-and-axle are the same in kind, or that the screw, the inclined plane, and the wedge are the same power in different shapes; but he did understand that while a single pulley gives you no advantage except by enabling you to apply your strength in the most effective manner, a second pulley takes half the weight off you.
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