DYNAMOMETER 570 DYNAMOMETER
Description
This page of the book is from "The New Student's Reference Work: Volume 2" by Chandler B. Beach, Frank Morton McMurry and others.
DYNAMOMETER
570
DYNAMOMETER
pressure (volts) and current (ampères), which gives the watts directly. The best
PRONY BRAKE
known forms are those of Siemens and the modified forms of Weston.
Dyne (dīn), the unit of force employed
in the metric system. It is defined as that force which, acting upon a mass of one gram, will produce unit-acceleration. If we denote the acceleration of gravity by g, then the weight of one gram is equal to g dynes. And, in general, we may say that the weight, W, of any body whose mass is m grams is mg dynes, or
w=mg dynes. A definition of the dyne which is exactly equivalent to that given above is the following: That force which, acting for one second, will produce unit-change of velocity in a mass of one gram. A megadyne is a force of one million dynes, and is about two per cent, greater than the weight of a kilogram.
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