Elements of surveying and levelling; with descriptions of the instruments and the necessary tables (1870)
Davies, Charles, 1798-1876 · New York and Chicago, A. S. Barnes & Company · leaf 91
(TSO) 2.892095 log AE 768.9 2.885870 In the right-angled triangle DAE, to find DE.TTe have, from Theorem IT., E : tan A : : AE : DE : hence,(a. c.) log E (90°) ...... 0.000000; log tan A (20° 15) .... 9.566932log AE (768.9) 2.885870 lo^ DE 283.66 2.452802 88 ELEMENTS OF SUKVEYIXa. [book II. Now,… … Note 2.—It should be remembered, that the vertical dis-tance which IS obtained by the calculation, is estimated froma horizontal line passing through the eye, at the time of ob-servation. Hence, the height of the instrument is to be added,in order to obtain the true result. SECO:NrD METHOD. 45,…
Surveying
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