Geodaesia : or, The art of surveying and measuring land made easy (1768)
Love, John, fl. 1688, Clark, Samuel · London : Printed for J. Rivington · leaf 93
or may turn roundupon it. To lay down an angle with the protra&or. If it were required by the protractor to lay downan angle of 30 degrees, draw the line AB, thentake the protractor, and putting a needle throughthe center point thereof, place the needle in A, fothat the center of the protractor… … with your protracting needle make a mark upon thepaper as at C; draw the line C A, which (hall makean angle, as B AC, of 30 degrees. If you furvey according to Mr. Norwoods methodbefore fpoken of, it will be neceffary to have thearch of your protractor divided accordingly, viz. intotwo quadrants,…
Surveying
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