bolometer
(bəʊˈlɒmɪtə(r))
[f. Gr. βολή beam of light + µέτρον measure.]
An electrical instrument of great sensitiveness for measuring radiant heat. Hence bolometric (bɒləʊˈmɛtrɪk), a.
| 1881 Nature XXV. 14 An instrument..capable of indicating a change of temperature as minute as 1-100,000th of a single Centigrade degree..is termed by its discoverer, Professor S. P. Langley, the bolometer, or actinic balance. 1882 Athenæum 2 Sept. 310/1 His ‘bolometer’, or radiation measurer—an instrument some twenty times more sensitive than the thermopile. 1881 C. A. Young Sun 306 Shown by the bolometric measures described above. |