Baly, E. C. C. (Edward Charles Cyril), b. 1871 · London, Longmans, Green · leaf 313
REGIONS 295 A diagram of the arrangement for focussing is shown inFig. 113, in plan and end elevation, a \s a. portion of thecollimator or camera tube, and ^ is a round metal block solderedto the side. The plug c is ground into a conical hole drilledin b, and carries a pinion wheel, e, which… … the opposite side of the tube a is a hole cut at k; and this ishermetically sealed with a glass plate i; the sliding tube is ruledin millimetres, and its position may be read off against a zeromark upon the tube a. The camera itself very much resembles a stop-cock placedin a vertical position. Fig.…
Spectrum analysis
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