A text-book of general astronomy : for colleges and scientific schools (1888)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston ; London : Ginn & Company · leaf 207
the slit is in its principal focus.This tube with slit and lens constitutes the u collimator so called be-cause it is precisely the same as the instrument used in connection withthe transit instrument to adjust its line of collimation (Article 60). Instead of looking at the spectrum with the naked… … Gratinu-SpcctroscopeCollimator ,S« Direct- Vision Spccti-oscope Fie. ldT. — Different Forms of Spectroscope. I*. 312. Construction of the Spectroscope.—The instrument, there-fore, as usually constructed, and shown in Fig. 107. consists of threeparts, — collimator, dispersion-piece, and…
Astronomy
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