A treatise on surveying, comprising the theory and the practice ; (1887)
Gillespie, W. M. (William Mitchell), 1816-1868, Staley, Cady, 1840- [from old catalog] ed · New York, D. Appleton and company · leaf 304
of the tri-angles D L G and D L B. To prove that D F is a third line of division, join MD and MA. ThenB M A = | BG A. From B M A take MF A and add its equivalent MFD,and we have MDFB=£BGA = HABDG-BDG) = MfABC-BDG) = iABO- £BDG. To MDFB add MDB, and add its equiva-lent, \ B D G, to the other side of… … 290 LAND-SUE YEYING. Fig. 320.
Surveying
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