A treatise on surveying ; in which the theory and practice are fully explained (1860)
Alsop, Samuel · Philadelphia, E. C. & J. Biddle & co. · leaf 299
/ Join KO, and draw CL n parallel to it. Through L draw LM parallel to GB. Make LK perpendicular toAD and equal to OP. With the centre N and radiusequal to PM, describe an arc cutting AD in F. Then FPEwill be the division line. g«si: H … ~1^M Demonstration.—As was proven, Art. 381, GFE = GOML = 2 GOL =2 GCK = GCI: whence ABEF = ABCI. But CI divides the trapezium intotwo parts having the given ratio; therefore, EF does so likewise. Calculation. Find GB, GA, GH, and GI. Then in OBP find OB andOP: thus GO is known. And because GO : GO…
Surveying
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