Herschel, John F. W. (John Frederick William), Sir, 1792-1871 · London : Longman, Rees Orme · leaf 87
scope *(that which joins the centres of its object-glass andeye-glass, and which is called in astronomy its line ofcollimation) be once well adjusted at right angles tothe axis of the transit, it will never quit the plane ofthe meridian, when the instrument is toned round onits axis. (126.) In the… … CHAP. II. OF THE TRANSIT INSTRUMENT. $1 always appear in the field of view, when properly illu-minated, by day by the light of the sky, by night bythat of a lamp introduced by a contrivance not neces-sary here to explain. The place of this system of wiresmay be altered by adjusting screws, giving…
Astronomy
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