A treatise on land-surveying; comprising the theory developed from five elementary principles; and the practice with the chain alone, the compass, the transit, the theodolite, the plane table, &cIllustrated by four hundred engravings, and a magnetic chart . 120 CHAL SURVEYIXG. [paei ii CD X DF X GH and HG. The inaccessible distance AB = CD2 X GH FG X FH If CD = CE, then AB = FG X FH (205) By symmetrical triangles. Take any convenient point,asC. Set stakes at two other Fig. 140. points, T) and D,in the same ^ ^^ Une, and at equal distancesfrom C. Take a point E, inthe line of AD; measure from
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A treatise on land-surveying; comprising the theory developed from five elementary principles; and the practice with the chain alone, the compass, the transit, the theodolite, the plane table, &cIllustrated by four hundred engravings, and a magnetic chart . 120 CHAL SURVEYIXG. [paei ii CD X DF X GH and HG. The inaccessible distance AB = CD2 X GH FG X FH If CD = CE, then AB = FG X FH (205) By symmetrical triangles. Take any convenient point, asC. Set stakes at two other Fig. 140. points, T) and D, in the same ^~ ^^ Une, and at equal distancesfrom C. Take a point E, inthe line of AD; measure fromit to C, and onward till CE= CE. Take a pomt F inthe line of BD ; measure fromit to C, and onward till CF =CF. Range out the Hnes ACand EDj and set a stake attheir intersection, A. Rangeout the lines BC and FD, and set a stake at their intersection, B. Measure AB. It will be equal to the desired distance AB.. (206) Otherwise: Takeany convenient point, as C, and set off equal distances pon each side of it, in thelmeofCA, toDandD. Setoff the same distances fromC, in the line of CB, to E andE. Through C, set out aparallel to DE, or DE, andset stakes at the points Fand F where this parallelintersects AE and BD.Range out the lines AD and EF, and set a stake at their inter-section A. Range out the Hnes BE and DF, and set a stake attheir intersection B. Measure AB, and it will be equal to thedesired distance AB.