Ball, R[obert] S[tawell], Sir, 1840- [from old catalog] · New York, H. Holt and company · leaf 55
lescope at all, nor will the reflectedimage of the wires be seen. But now suppose that the telescope • was placedwith its axis very close to the line t r, then the reflectedimage would be visible in the field, and it would bepossible to move the telescope until the reflected imageof the cross is… … Zenith Distance. 37 we are to read off the circle again by the pointer, andthe difference between the reading now obtained, andthe reading when the telescope was pointed to thestar, expresses exactly the angle through which thetelescope has been turned when it is moved from thestar to the nadir.…
Astronomy
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