. Elementary lessons in the physics of agriculture. Agricultural physics. [from old catalog]. 32 the two arms are of equal length, each being a radius of the pulley. At B the lower pulley is movable, traveling upward with the load, and here we have the equivalent of a lever of the second class, with the fulcrum at the side of the pulley in contact with rope 2. As the load hangs from the axis of the pulley the power-arm is the diameter of the pulley and the weight-arm is the radius, giving us the equation: P. X P. X W. A. or 5x2= 10x1. â ^mm I © /If ^©^^ @/'^ w ® ^)=/^. r,^ At C, D
. Elementary lessons in the physics of agriculture. Agricultural physics. [from old catalog]. 32 the two arms are of equal length, each being a radius of the pulley. At B the lower pulley is movable, traveling upward with the load, and here we have the equivalent of a lever of the second class, with the fulcrum at the side of the pulley in contact with rope 2. As the load hangs from the axis of the pulley the power-arm is the diameter of the pulley and the weight-arm is the radius, giving us the equation: P. X P. X W. A. or 5x2= 10x1. â ^mm I © /If ^©^^ @/'^ w ® ^)=/^. r,^ At C, D and E are combinations of several movable and fixed pulleys. In C we have a system with several sepa- rate cords, and in this the relation of power to weight is expressed by the equation ^=W., where n equals the number of movable pulleys, or in C, P. X 2-'=W., whence, 4 x 2 x 2=r 16. In D and E we have two systems of pulleys where a sinfifle continuous cord is used. It makes no difference whether the pulleys are arranged side by side, as in D, or one above the other, as in E, the relation of power to weight is expressed by the equation: P. X No. cords supporting W. = W., whence for D, i x 1 â 16 and for E, 1 x 6=:21. These equations always suppose no loss due to friction or in bending the ropes. There is, however, always a large and variable loss, so the actual lifting power is less than the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original King, F[ranklin] H[iram], 1848- [from old catalog]. [Madison, Wis. ] State journal printing company
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