Abstract
WHEN the temperature during an industrial process must be kept constant it is more economical to do it automatically than by hand, and in a thirty-page pamphlet issued by Messrs. Negretti and Zambra methods of control are described. They depend on mercury in steel thermometers in which the capillary tube ends in a Bourdon tube which uncoils as the temperature of the bulb of the thermometer rises. This actuates a mercury switch if the heat supply to the furnace or chamber is electrical, or a compressed valve in a two-atmosphere air supply leak if the heat supply is gas or liquid. The change of pressure of the air supply operates a valve in the gas or liquid supply pipe.
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Automatic Temperature Control. Nature 130, 577 (1932). https://doi.org/10.1038/130577b0
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DOI: https://doi.org/10.1038/130577b0