PYROMETER

n. Pir-oam'eat-u5r. From irup, flre, and ^rpov, a measure. Fr., pyrometre. Ger., P. An apparatus for measuring high temperatures (e. g., by noting the changes in the expansion of metallic or porcelain bars). [B, 93 (a, 14).] Optic p. Of Becquerel. a photometer used as a p., the luminous intensity of a body being found to correspond to its temperature. [B, 38 (a, 14).] Wedgwood's p. A p. founded on the contraction of dried porcelain clay when heated, as measured by a metallic rule. [B, 93 (a, 14).] [s. 367]