Young, Charles A. (Charles Augustus), 1834-1908, Young, Anne Sewell, b. 1871., ed · Boston, New York [etc.] Ginn and Company · leaf 435
thout taper, andprecisely in line with each other, —inother words, they must be portions ofone and the same geometrical cylindertion, with errors nowhere exceeding yqitoto °^ an incn> taxesthe highest skill of the mechanician. When accurately con-structed and adjusted, the middle wire of the… … Fig. 151. — Reticle of the TransitInstrument. To fulfil this condi- 545. The Adjustments of the Transit. — These are four in number: 1. The reticle must be exactly in the focal plane of the object-glass,and the middle wire truly vertical. 2. The line of collimation (i.e., the line which joins the…
Astronomy · Constellations
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