Beans, E. W. [from old catalog] · Philadelphia, J. W. Moore · leaf 71
66 A MANUAL FOR SURVEYORS. … Make C D as many partsof A C as you do C E ofC B; join D E and measureit. Then, as C D : C A ::D E : A B, or as C E :CB::DE:ABDEisparallel to A B. Case 6. To prolong the line A B across a river,&c, and determine the distance across to E. At a point C make the an-gle B C D a right one, at Dmake…
Surveying
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