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Excerpt from The Digest of Physical Tests and Laboratory Practice, Vol. 1: A Resume of Practical Tests Made in the Laboratories of the World; April, 1896 The only satisfactory method of ascertaining these quantities is by the use of some form of dynamometer - by which we mean an instrument or machine for measuring the power exerted by an engine or electro-motor, or the amount of power consumed in driving a single machine or machinery plant. A Dynamometer is primarily an instrument to measure the work done by an effort of some kind, the result being usually expressed in foot - pomza's and given in a lump sum, as meaning ten thousand foot-pounds as in the case of the Integrating Dynamometer. But more frequently the result 15 a diagram area as by the Recording Dynamometer, which area, when measured by duly considering the co-ordinates and determining the area, represents the foot-pounds. Thus the steam engine indicator is, in one sense, a recording dynamometer, because the pressure ordinates of the indicator diagram multiplied by the stroke abscissas, gives an area which represents the foot-pounds of work performed by the engine for the corresponding stroke of that engine. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Vols. 1-69 include more or less complete patent reports of the U. S. Patent Office for years 1825-1859. cf. Index to v. 1-120 of the Journal, p. [415]