Jones, H. Spencer (Harold Spencer), 1890- · London E. Arnold & co. · leaf 220
analyse the light from any source into its constituentvibrations. Any spectroscope is composed of three portions :(i) The collimator, (ii) the dispersion piece, (iii) the telescope.The colhmator. Fig. 69, consists of a tube, having at one endan achromatic object-glass and at the other a narrow… … DOMIMON AsTRdlllVSlCAL ( ;b.sKK\ATOK V 72-INCll REFLECTOR. ASTRONOMICAL INSTRUMENTS 187 or a bundle of prisms or of a diffraction grating. The latter is apiece of glass or speculum metal ruled with numerous fineequidistant parallel lines, which has the property of analysingthe hght and reflecting…
Astronomy
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