Online Encyclopedia

PYROMETER (Gr. iri p, fire, µErpov, a...

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Originally appearing in Volume V22, Page 693 of the 1911 Encyclopedia Britannica.
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PYROMETER (Gr. iri p, fire, µErpov, a measure), an instrument for measuring high temperatures. The term was first used by Musschenbroek to denote an instrument wherein the expansion of a metal rod measured the temperature. Discontinuous thermoscopes, depending on the fusion of a metal or salt, are also employed. Prinsep prepared a series of alloys of silver and gold, and of gold and platinum, whose melting points, as determined by accurate instruments, covered a range of temperature from 954 to 1775°, at intervals of from 25° to 3o°. By placing ingots in a furnace and observing which one melted a fair idea of the temperature was obtained. Carnelley and Williams employed certain salts of known melting point; whilst the Seger's cones, employed in porcelain manufacture, depend on the fusion of small cones made of clay. (See THERMOMETRY for scientific forms.)
End of Article: PYROMETER (Gr. iri p, fire, µErpov, a measure)

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