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By means of a prony brake, its power output was carefully measured and from this the amount of power required for it to turn certain fans or test clubs was determined.

How to Find Out the Power Developed.—The measure of power produced by an engine, or other source, is so interesting to boys that a sketch is given of a Prony Brake, which is the simplest form of the Dynamometer, as these measuring machines are called.

Tests with a Prony brake showed that the motor developed 128 H.P.

Everything was measured—the gas by a 60 light, and the air by a 300 light meter; the indicated horse power, by a steam-engine indicator; the useful work, by a Prony brake; the temperature of the water, by a standard thermometer; and that of the escaping gases, by a pyrometer.

The Prony brake on the pulley of the dynamo is quite slack, allowing it to revolve freely.