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THERMOSTATIC BIMETAL

THERMOSTATIC BIMETAL By ERNEST R. HOWARD, '34, H. A. Wilson Co. Many important problems of control in industrial processes are being solved by the use of THERMOSTATIC BIMETAL . Mr. Howard dis- cusses a number of these applications and outlines the basic principles of BIMETAL behavior. One of the most unique BIMETAL applications in production today is a circuit breaker containing a BIMETAL helix of two turns shunted by a piece of copper braid welded to the ends of the helix and used as the complete and short circuited secondary of a current transformer. The two turns of this secondary produce a voltage which dissipates energy into the BIMETAL itself, heats the BIMETAL helix, causes it to rotate and if primary current exceeds a given value causes the helix to trip a dis- connect switch.

The automatic choke on a modern gasoline engine is a good example of the third classification mentioned above. Here nc attempt is made to control temperature itself, but the supplj of air to a fuel-air mixture is controlled by the temperature oi that air. The usual automotive type of choke control consists ol

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