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Encyclopedia Britannica



PYROMETER (Gr. iri p, fire, Erpov, a measure)

This article appears in Volume V22, Page 693 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: PYR-RAY
PYROMETER (Gr. iri p, fire, Erpov, 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.)


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