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 137
lar compass may be assigned forthe solar attachment. io8 SURVEYING. THE SEXTANT. 115. The Sextant is the most convenient and accuratehand-instrument yet devised for measuring angles, whetherhorizontal, vertical, or inclined. It is called a sextant becauseits limb includes but a 6o° arc of the… … Fig. 21. on board ship. It is exclusively used in observations at sea,and is always used in surveying where angles are to be meas-ured from a boat, as in locating soundings, buoys, etc., as wellas in reconnoissance work, explorations, and preliminary sur-veys. It has been in use since about 1730.…
Surveying
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