Davies, Charles, 1798-1876 · New York, Cincinnati [etc.] American book company · leaf 63
s to Bff, and make themequal in length to AB and BF; draw CD, it will be the pro-longation required. FG is equal in length to BC, provided theperpendiculars BF and GO are accurately laid out. This is agood method to use in passing trees or small obstacles, providedthe distance between… … Third Method.—From any point A, measure AB; throughits middle point x, run CD, making Dx = Cx ; then DB will be SEC. I.] MEASUREMEN^T OF DISTAI^CES. 57 parallel to A C. From D run a line, DE, through any point ofthe line AB, as y, making yE of such length that, By : Dy :: Ay : Ey. Then through z,…
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