Emerson, William, 1701-1782 · London : Printed for J. Nourse · leaf 211
e pole. By the Scale. Apply CF to the femi-tangents, and note thedep-rees. Take the fum of thefe degrees and ofthe circles diftance from its pole, if the circle lieall on one fide, but their difference if itencom-pafles the pole of projeftion -, fet the femi-tangentof this fum or difference from C… … c Se-a. I!. OF THE SPHERE. ij {\i the circle lies all one way) or of half the dif- Fig.ference (if it encompalTes the pole of projedion), 31.from C to the pole p j and the femi-tangent of thefupplement, C^ gives the external pole q. In a great circle as DLE, draw the line of mea-fures AB perp. to…
Mechanical engineering
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