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 196
Fig. 45. angles to three known points for the location of the point ofobservation. This is known as the three-point problem andis discussed in Chap. X. … Fig. 46. Paper protractors are usually full circled, from 8 to 14inches in diameter, graduated to half or quarter degrees.They are printed from engraved plates on drawing- or tracing- 168 SURVEYING. paper or bristol-board, and are very convenient for plottingtopographical surveys. The map is drawn…
Surveying
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