A complete treatise on practical land-surveying, in seven parts; (1839)
Nesbit, A[nthony], 1778-1859. [from old catalog] · London, Longman, Orme, Browne, Green, and Longmans; [etc., etc.] · leaf 131
required.At the verge of the impediment, havingfixed the mark m, ina right line with Aand B ; measure fromA to m; and at m,by the help of yourcross, erect the per-pendicular m a, whichmeasure to the out-side of the interposedobstruction, as at c.Then on the otherside, as at n, in aline with A and… … 4A Part III.) LAND-SURVEYING. 109 PROBLEM XII. LINES UPON WHICH THERE ARE IMPEDIMENTSOBSTRUCTING THE SIGHT EXAMPLE. Suppose C D E F to represent the base of a building, whichobstructs the sight, and through which it is necessary that astraight line should pass from an object at A, Measure from A…
Surveying
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