Young, Charles A. (Charles Augustus), 1834-1908, Young, Anne Sewell, b. 1871., ed · Boston, New York [etc.] Ginn and Company · leaf 348
ry Draper in this country werethe pioneers ; now the photography of stellar spectra is an im-portant part of the program of nearly all the large observatories. Pickering uses an 11-inch telescope, formerlybelonging to Draper,with a battery of fourenormous prisms placedin front of the object-glass,… … Fig. 111. Arrangement of the Prisms in the SlitlessSpectroscope. §458] PHOTOGRAPHY OF STELLAR SPECTRA. 331 width to the spectrum formed upon the sensitive plate, which isplaced at the focus of the object-glass : if the clock-work followedthe star exactly, the spectrum would be a mere narrow streak.…
Astronomy · Constellations
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
