. The Family tutor . Fig. 167. Fig. 168. Fig. 169. called capstan-bars, by which it is worked by men, who walk round the capstan, and it revolve by pressing the ends of the levers forward. .^r---. r^,,,- , ■^ ^ ° .ji^rit/i i£Oi,tiaqo gji makj 306 NATURAL PHILOSOPHY. [The tread-mill is another variety. In this case the weight of several peopletreading on the circumference of a long wheel causes it to revolve. The paddle-wheelof a steam-boat acts on the same principle ; the water, which offers a resistance to themotion of the paddle-boards, is the power.—W. T. K.] Wheels and axles are often made
. The Family tutor . Fig. 167. Fig. 168. Fig. 169. called capstan-bars, by which it is worked by men, who walk round the capstan, and it revolve by pressing the ends of the levers forward. .^r---. r^,,,- , ■^ ^ ° .ji^rit/i i£Oi,tiaqo gji makj 306 NATURAL PHILOSOPHY. [The tread-mill is another variety. In this case the weight of several peopletreading on the circumference of a long wheel causes it to revolve. The paddle-wheelof a steam-boat acts on the same principle ; the water, which offers a resistance to themotion of the paddle-boards, is the power.—W. T. K.] Wheels and axles are often made to act upon one another by the aid of cogs, as inclockwork and mill machinery. In these cases the cogs on the periphery of the wheeltake the name of teeth, those on the axle the name of leaves, and the axle itself iscalled a pinion. The law of equilibrium of such machines may be easily demonstrated to be, thatthe power multiplied by the product of the number of teeth, in all the wheels, is equalto the weight m
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