A Treatise On Surveying, Comprising the Theory And the Practice; 2
A Treatise On Surveying, Comprising the Theory And the Practice; 2
W M William Mitchell Gillespie
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[20.] COS. c ^^ ■■ ^.^r., ni = 30' e=10° CE = 1,000 the value of [20] = -0023 fw = 30' e = 30° C E = 500 " " " = -012 and the formula may be written, ML = OEcos.e. [21.] Stadia notes are reduced with the aid of either (1) tables, (2) graphic diagrams, or (3) slide rules constructed for that purpose. The values of / and c being peculiar to each instrument, and Digitized by VjOOQIC 314 TOPOQRAPHT. depending upon the unit, must be determined for each instrument, and be expressed in the units of th...e work. It is only necessary to determine the values of (/+ c) cos. e and (/+c) sin. tf for a comparatively few values of e depending upon the degree of precision sought. If elevations are to be computed to the nearest tenth, determine the values of a, e,^ e,,^ e,„^ etc., for which (/+ c) sin. e„ = 15 (/+ sin. Bfff = '25, etc. Then, for all values of e between o and e,^ (/+ c) sin. e = o; for values of e between e, and e,,^ (/+ c) sin. e will be taken = 0*1, etc. Still fewer values of e for (/+ c) cos.
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