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 67
8 SUR VE YING. the line, the vernier is to be moved in the direction of the hands xof a watch an angular amount whose tangent is j. If the trial-line comes out to the left of the point, move the vernierin a direction opposite to the hands of a watch. PRISMATIC COMPASS. 40. The Prismatic Compass is… … Fig. 9. sight is established by means of the etched line on the glasscover S. It is used in preliminary and reconnoissance work, in clearing out lines, etc. EXERCISES FOR COMPASS ALONE OR FOR COMPASS AND CHAIN. 41. Run out a line of about a mile in length, on somewhat uneven ground,establishing…
Surveying
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