Journal of the Franklin Institute; devoted to science and the mechanic arts (1826)
Franklin Institute (Philadelphia, Pa.) · Oxford, Eng. [etc.] Pergamon Press [etc.] · leaf 363
ich in-dicate the quantum of force applied by a horse upon a rail-way, bythe inflexion of springs, lose their elasticity when kept at work forany considerable time; the oscillations of the index-pointer, tooymake it impossible to ascertain the medium of unequal draught ap-plied by the animal in… … be described. This instrument consists of a hollow metallic cylin-der, A, in which is placed a floating piston, B, which should be aboutone-tenth of an inch less in diameter than the cylinder, in which itmust move freely up or down. To prevent friction, four small roll-ers should be inserted into…
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