A treatise on surveying, comprising the theory and the practice (1906)
Gillespie, William Mitchell, 1816-1868, Staley, Cady, 1840- · New York D. Appleton · leaf 47
(50 centi-metres) in diameter; and even these are being gradually replacedby instruments with circles as small as 13 inches (30 centimetres) 36 GEODESY. in diameter, tlie means of graduating the circle becoming morenearly perfect. The shape, however, is still quite different in dif-ferent… … or in referring station marks, and also for making rough astronom-ical observations for latitude, time, and azimuth. TRIANG ULA TIOK 37 Fig. 44G is a theodolite, with an 8-inch horizontal circle, used inthe measurement of horizontal angles, and for astronomical work.Fig. 447 represents the latest…
Surveying
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