combining form (on Greek analogies) of SPECTRUM, chiefly employed in a number of recent terms, as Spectroheliograph, -heliographic a., -microscopical a., -phone, -phonic a., -photometer, -photometric a., -photometrically, -pyrometer, -telescope.
Others are spectrobolograph, -bolographic adj., -bolometer, -bolometric adj., -chemistry, -colorimetry, -comparator, -photograph(y, -polarigraph, -polarimeter, -polariscope, etc.
1892. Athenæum, 16 July, 102/1. An instrurnent called the *spectroheliograph…, by means of which … photographs are now made of all the prominences visible round the entire circumference of the sun with a single exposure. Ibid. (1907), 6 April, 415/3. Dr. Lockyer showed spectroheliographs of the sun. Ibid. (1905), 29 April, 535/2. *Spectroheliographic Results explained by Anomalous Dispersion.
1885. trans. Behrens’ Micros. in Bot., V. 139. The *spectro-microscopical apparatus … has become an important instrument in the investigation of the coloring matter of plants.
1881. A. G. Bell, Sound by Radiant Energy, 41. These substances are put in communication with the ear by means of a hearing-tube, and thus the instrument is converted into a veritable *spectrophone. Ibid. Suppose we smoke the interior of our *spectrophonic receiver.
1881. Nature, XXIV. 552. Photometric comparison of luminous sources of different colours, by M. Crova. He uses a *spectrophotometer.
1884. Boston (Mass.) Jrnl., 13 Sept. A *‘spectrophotometric study of pigments,’ by Professor Nicolls.
1897. Allbutt’s Syst. Med., IV. 285. Normal fresh urines … examined *spectro-photometrically.
1881. Nature, XXIII. 524. The *spectropyrometer is proved practically useful.
1880. Athenæum, 25 Sept., 405/1. A *spectro-telescope,… the purpose of which is to enable the observer to survey large portions of the sun’s disc at once in homogeneous light.
