Jones, H. Spencer (Harold Spencer), 1890- · London E. Arnold & co. · leaf 208
at the errors are small, their effects can be treatedas independent of one another and the required correction canbe easily obtained. Consider first the error of level. We will assume that theaxis is perpendicular to the N.S., but that instead of beinghorizontal, it is inclined to the horizon at a… … Fig. 63.—Level Error of TransitInstrument. 176 GENERAL ASTRONOMY
Astronomy
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