Manual of modern surveying instruments and their uses .. (1893)
Lietz, firm, math. instr. makers, San Francisco. (1893. The A. Lietz company) [from old catalog] · [San Francisco] The Company · leaf 124
s degree. I have seen it large enough tocause an error of three minutes in a right-angle. As it may be necessary to try to do good work with such an instrument, I willexplain my method of examining an instrument having two verniers. THE A. LIETZ COMPANY. 95 Set one vernier at zero and read the… … difference of the verniers from 180 degrees; subtract this mean quantity from eachof the original readings (having due regard to the algebraic signs), and then use theresultant new column, as follows: With any convenient radius draw a circle on a cardboard and divide the circleinto as many parts as…
Surveying
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