Ball, R[obert] S[tawell], Sir, 1840- [from old catalog] · New York, H. Holt and company · leaf 39
ed so as tosecure as much rigidity aspossible. At the extremi-ties of the axis are pivots,x y, which turn in suitable fixed bearings supportedon solid masonry piers. Thus the transit instrumentcan be moved in one plane only. In the focus of thetelescope, close to the eye-piece at a, are stretched… … The Transit Instrument. 21 of the star is formed in the same plane as the spiderslines, and as the star moves by the diurnal motionthe image of the star is seen to pass across each ofthe lines in succession. The central line a b (fig. 8)passes through the optical axis of the telescope. Inaddition…
Astronomy
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