File:Britannica Dynamometer 9.jpg

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Britannica_Dynamometer_9.jpg (437 × 434 pixels, file size: 63 KB, MIME type: image/jpeg)

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English: When a shaft is driven by means of gearing the driving torque is measured by the product of the resultant pressure P acting between the wheel teeth and the radius of the pitch circle of the wheel fixed to the shaft. This figure, which has been reproduced from J. White’s A New Century of Inventions (Manchester, 1822), illustrates possibly the earliest application of this principle to dynamometry. The wheel D, keyed to the shaft overcoming the resistance to be measured, is driven from wheel N by two bevel wheels L, L, carried in a loose pulley K. The two shafts, though in a line, are independent. A torque applied to the shaft A can be transmitted to D, neglecting friction, without change only if the central pulley K is held from turning; the torque required to do this is twice the torque transmitted.
Date
Source Encyclopædia Britannica, 1911
Author Encyclopædia Britannica, Volume 8, Slice 9., available freely at Project Gutenberg

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Public domain This image comes from the 13th edition of the Encyclopædia Britannica or earlier. The copyrights for that book have expired in the United States because the book was first published in the US with the publication occurring before January 1, 1929. As such, this image is in the public domain in the United States.
Public domain This image comes from the Project Gutenberg archives. This is an image that has come from a book or document for which the American copyright has expired and this image is in the public domain in the United States and possibly other countries.

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current12:07, 19 February 2011Thumbnail for version as of 12:07, 19 February 2011437 × 434 (63 KB)Keith Edkins (talk | contribs)=={{int:filedesc}}== {{Information |Description={{en|When a shaft is driven by means of gearing the driving torque is measured by the product of the resultant pressure P acting between the wheel teeth and the radius of the pitch circle of the wheel fixed

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