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 143
the slidebars //. These bars are fastened to the mirrors and slidefreely through the studs Z Z^ set upon the movable arms B Br * For a description of the three arm protractor see chapter VI.f See chapter X., for a discussion of this problem.8 114 SURVEYING. The distance of these studs from the… … Figs. 23 and 24. The theory of the instrument is shown in Fig. 25. The rayof light R is reflected from c to e and thence down the tele-scope to A. The object in the prolongation of AB casts the ADJUSTMENT, USE, AND CARE OF INSTRUMENTS. 115 ray Be directly down the telescope. The angle formed bythe…
Surveying
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