Davies, Charles, 1798-1876 · New York, Cincinnati [etc.] American book company · leaf 184
in B (41° 24) .... 9.820406log AB (780) 2.892095 log AB 768.9 ...... 2.885870 In the right-angled triangle DAE, to find DE.We have, from Theorem IV, E : t3inA :: AB (a. c.) logi^ (90°) . .log tan A (20° 15) .log^^ (768.9) . . logZ>^ 283.66 . . Now, since DC is less than DB,it follows that the… … 178 ELEMEIfTS OF SURVEYmG. [book IV. Note 2.—It should be remembered that the vertical distance,which is obtained by the calculation, is estimated from a hori-zontal line passing through the eye, at the time of observation.Hence, the height of the instrument is to be added, in order toobtain the…
Surveying
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