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 286
s 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 place by weights. Now… … 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 of the drawing must exceed thelongest readings. We now have a protractor…
Surveying
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![An illustration from Nicolai Copernici Torinensis De reuolutionibus orbium coelestium, libri VI : Habes in hoc opere iam recens nato, & aedito, studiose lector, motus stellarum, tam fixarum, quàm erraticarum, cum ex ueteribus, tum etiam ex recentibus obseruationibus restitutos: & nouis insuper ac admirabilibus hypothesibus ornatos. Habes etiam tabulas expeditissimas, ex quibus eosdem ad quoduis tempus quàm facillime caculare poteris. Igitur eme, lege, fruere. [Line in Greek] (1543)](https://img.insideoutlibrary.com/img/200/ia-nicolaicopernici00cope-402-279.webp)
