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 507
l.* 3. The author has measured a number of bases about onehalf mile in length, in connection with students practice sur-veys, by the methods given above, and in each case obtained aprobable error of the mean of three or four measurements ofless than one-milHonth part of the length of the line.… … Fig. 132, GEODETIC SURVEYING. 477 MEASUREMENT OF THE ANGLES. 356. The Instruments used in triangulation are desig-nedespecially for the accurate measurement of horizontal angles.This demands very accurate centring and fitting at the axis, andstrict uniformity of graduation. It was formerly supposed…
Surveying
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