[f. as prec. + -GRAPH.]
1. An instrument used for photographing a spectrum.
1884. Young, in Proc. Amer. Acad. Arts & Sci., 238. In July, 1876, several photographs of the spectrum of Vega were taken with an apparatus which Dr. Draper called the spectrograph.
1889. V. Schumann, in Anthony’s Photogr. Bull., II. 394. The color sensitiveness of the plate I find out with the aid of my Quartz spectrograph.
1893. Nation, 16 Feb., 126/2. With the eleven-inch Draper spectrograph nearly a thousand photographs were taken.
2. = SPECTROGRAM.
1891. Pall Mall Gaz., 26 Sept., 6/1. A few spectrographs of pure and impure blood.
1898. Edinb. Rev., April, 306–7. Rich harvests of photographs and ‘spectrographs’ were garnered.
Hence Spectrographic a., relating to a spectrograph or the observations made with it; Spectrographically adv., in a spectrographic manner; Spectrography, the art of using the spectrograph.
1884. Science, III. 727/1. Spectrographic operations are … much more sensitive to atmospheric conditions than are visual observations.
1900. Edinb. Rev., April, 458. ‘Spectrography’ is the complement of spectroscopy. Ibid., 460. The spectrographic impression of a hydrogen star. Ibid., 474. Having spectrographically surveyed the entire heaven.
1903. Agnes Clerke, Probl. Astrophys., 3. Spectroscopic photography, or ‘spectrography’ dates from Sir William Huggins’s adoption of the dry gelatine process in 1876.
