| http://www.w3.org/ns/prov#value | - Nothing more than the most elementary mathematics is required to follow it.Beginning with the simplest of machines ??? the lever ??? the text proceeds with discussions of the block and tackle (pulleys and hoists), wheel and axle, the inclined plane and the wedge, the screw, and different types of gears (simple, spur, bevel, herringbone, spiral, worm, etc.).
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