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 510
Fig, 133. GEODETIC SURVEYING. 479 … Fig. 134. 48o SURVEYING. from their relative angular elevations or depressions, it is usual-ly necessary to have a vertical limb. This instrument couldnot be used as a repeater. In Fig. 134 is shown an altazimuth instrument, or an in-strument designed for accurately measuring altitudes as well…
Surveying
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