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 284
one of the spaced lines on theplot. This circle then has its position parallel to that of theprotractor circle printed on the sheet, and an azimuth takenfrom the one will agree with an azimuth taken from theother. When this auxiliary protractor has been so centredand oriented, let it be held in… … MM I M I MM I llll I II II I II I ll M M I I Ml I MM I II II I I III lllll Fig. 64. tirely, so that when the flap is turned back the space AFBis left open. This space is to be large enough to include thelongest side-readings when plotted to scale ; that is, the radius,CF, of the circle to the scale…
Surveying
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