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Britannica Dynamometer 1
 

 

 

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Summary

Description
English: The principle of the compensating brake devised by J. G. Appold (1800-1865) is shown. A flexible steel band, lined with wood blocks, is gripped on the motor fly-wheel or pulley by a screw A, which, together with W, is adjusted to hold the brake steady. Compensation is effected by the lever L inserted at B. This has a slotted end, engaged by a pin P fixed to the framing, and it will be seen that its action is to slacken the band if the load tends to rise and to tighten it in the contrary case. The external forces holding the brake from turning are W, distant R from the axis, and the reaction, W1 say, of the lever against the fixed pin P, distant R1 from the axis. The moment of W1 may be positive or negative. The torque T at any instant of steady running is therefore {WR ± W1R1}.
Date

1911(1911)

Source

Encyclopædia Britannica, 1911

Author

Encyclopædia Britannica, Volume 8, Slice 9., available freely at Project Gutenberg

Permission
(Reusing this file)

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Licensing

Public domain This image comes from the 12th edition of the Encyclopædia Britannica or earlier. The copyrights for that book have expired and this image is in the public domain.
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