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Bible Encyclopedias
Pyrometer
1911 Encyclopedia Britannica
or (Gr. irup, fire, Arpov, 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 9540 to 1775°, at intervals of from 25° to 30°. 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)
These files are public domain.
Chisholm, Hugh, General Editor. Entry for 'Pyrometer'. 1911 Encyclopedia Britanica. https://www.studylight.org/encyclopedias/eng/bri/p/pyrometer.html. 1910.
