Popplewell, William Charles, 1865- · London, New York [etc.] Longmans, Green and co. · leaf 124
nsand horizontal angles and angles of elevation -piG. read, the vertical anglesbeing taken to the cross-bar of the pole, and its height from the groundafterwards subtracted from the determined height. The followingexamples dea!4with a case such as this. In Fig. 98 a perpendicular from the highest… … AC = AB and, similarly, From theseand, also sin ABCsin ACBsin BAG~~ sin ACBh = AC tan 0,h = BC tan 6 These two values of h should be the same if the work has beencarried out correctly. The following are two worked-out problems. Example of Calculation of Height of a Mountain.—A baseline AB is 2000…
Surveying · Geodesy
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