1987.0487.285 Texas Instruments Collection Object

Thermostat Switch
TI number: P00239

The item is a very early Spencer thermostatic switch. It had a rod-and-tube bimetallic temperature sensing element and appears to use a monometallic Klixon disc for snap-action control of the electrical connection.

This thermostatic switch was for industrial control. It has a tag dated 1-28-31. An internal plate had patent dates of 3-13-23 and 1-15-24 and a Westinghouse trademark. A few years after its formation, Spencer Thermostat Company was sold to Westinghouse and later to General Plate to form Metals and Controls which has merged into TI in 1959. See the Artifacts Historical Files for additional details supplied by Lyle McBride.

Related material in collection: P00238, 240-1.
Texas Instruments (Lyle McBride.)

Thermostat Switch

© Copyright 2000 Smithsonian Institution

Thermostat Switch

© Copyright 2000 Smithsonian Institution

Thermostat Switch

© Copyright 2000 Smithsonian Institution





National Museum of American History


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