Geodaesia : or, The art of surveying and measuring land made easy (1768)
Love, John, fl. 1688, Clark, Samuel · London : Printed for J. Rivington · leaf 92
you have furveyed by the needle, by placingthe diameter of the protractor upon a meridian linemade upon your paper, you may readily, witha needle upon the arch of the protradlor, fet offthe true fituation of any line from the meridianwithout fcratching the paper, as may happen if youufe the line of… … For the ufe of the protradtor, you muft have afine fewing needle, put into a fmail handle of wood,or ivory, or the like, which is to put through thecenter of the protractor to any point affigned uponthe paper, that the protractor may turn roundupon it. To lay down an angle with the protra&or.…
Surveying
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