Davies, Charles, 1798-1876 · New York, Cincinnati [etc.] American book company · leaf 170
the error, by the capstan screwson each side of the telescope over the cross-wire ring. As theeye-piece inverts the position of the wires, the operation of loos-ening one of the screws and tightening the other on the oppositeside, must be conducted as if to increase the error observed.To insure the… … SEC. I.] SURVEYORS TRANSIT. 163 Let AA represent theline of collimation pro-longed both ways from theinstrument at /, and sup-pose that the intersectionfalls at B, the cross-wires not being in adjustment; on reversingthe telescope the intersection will fall at B, as far to the left ofA as B was to…
Surveying
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