I.C.S. reference library : a series of textbooks prepared for the students of the International Correspondence Schools and containing in permanent form the instruction papers examination questions, and keys used in their various courses (1904)
International Correspondence Schools · Scranton : International Textbook Co. · leaf 251
= JFx d^X d^X d^, etc. Since the radii of several circles are in the same propor-tion to one another as the diameters of the same circles, itfollows that the radii may be used instead of the diametersin the above rule. 26 MACHINE ELEMENTS. Example.—If the radius of the pulley A, Fig. 19, is 20… … Fig. 19. Solution.—Applying rule 13, we have ■ 1X20X15X24= ^X4x5x4, IV: 7.20080 90 lb. Ans. 40, Although the combination of wheels in this exampleenables the lifting of a weight 90 times as great as the forceapplied, it has been necessary to exert the force through adistance 90 times the height…
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