The theory and practice of surveying. Designed for the use of surveyors and engineers generally, but especially for the use of students in engineering (1886)
Johnson, J. B. (John Butler), 1850-1902 · New York, J. Wiley & sons · leaf 69
according as the sun is south or north of the equator. Thepolar axis must therefore make an angle with the horizonequal to the latitude of the place, and the line of collimationmust deviate from a perpendicular to this axis by an angularamount equal to, and in the direction of, the suns… … Fig otherwise any motion of the line of collimation about its axiswould not bring it upon the sun. In Fig. 10 is shown a cut of this instrument as manufac- ADJUSTMENT, USE, AND CARE OF INSTRUMENTS. 41 tured by Young & Sons, Philadelphia. The polar axis is shownat/, and the terrestrial line of…
Surveying
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