Thomas Davidson,
Chambers's Twentieth Century Dictionary 1908…
(1908)
“ Pyrophotography, pī-rō-fō-tog′ra-fi, n. any photographic process in which heat is applied to fix the picture.Pyroscope, pī′rō-skōp, n. an instrument for measuring the intensity of radiating heat. [Gr. pyr, pyros, fire, skopein, to view.] Pyrosilver, pī-rō-sil′vėr, n. electroplated ware in which the silver is made to sink into the pores of the plated baser metal by the action of heat. ”
