Elementary lessons in the physics of agriculture elementarylesson01king Year: 1894 thousand pounds to the end of lever I, and this pressure will sustain a load of twenty thousand pounds placed at W. For levers in combination the continued product of +he power and power-arms is equal to the w^eight into the contin- ued product of the weight-arms. P. X P. Arms=W. x W. Anns, or, 2X10X10X10X 10=20,000xlxlxlxl. In the platform scales the platform is supported at its four corners by bearings which rest upon four levers, the ends of which are joined by means of a vertical rod to the short end of th
Elementary lessons in the physics of agriculture elementarylesson01king Year: 1894 thousand pounds to the end of lever I, and this pressure will sustain a load of twenty thousand pounds placed at W. For levers in combination the continued product of +he power and power-arms is equal to the w^eight into the contin- ued product of the weight-arms. P. X P. Arms=W. x W. Anns, or, 2X10X10X10X 10=20,000xlxlxlxl. In the platform scales the platform is supported at its four corners by bearings which rest upon four levers, the ends of which are joined by means of a vertical rod to the short end of the graduated scale beam. The accuracy and sensitiveness of such scales depend upon the exactness with which the lever arms are constructed and the delicacy and durability of the bearings and fulcrums which transmit the pressure to the levers. 34. The Locomotion of Animals.— Most of the higher animals which travel by means of appendages to their bodies propel themselves with a system of levers which are operated by sets of very powerful muscles. The mechanism of muscles and their method of contraction make it possible for them to move through only very small distances, and hence w^iere considerable movements are to be executed the results are secured by attaching them to the short arms of levers. In the forearm, for example, the biceps muscle acts upon a lever whose power-arm is only one-sixth as long as the weight-arm, and hence when a weight of fifty pounds is held as represented in Fig. 10 the muscle must exert a tension of three hundred pounds.
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