Davies, Charles, 1798-1876 · New York, Cincinnati [etc.] American book company · leaf 181
ee hours perhaps, as it isnot good practice to set the altitude when the star is too nearthe meridian, turn the plate upon its spindle towards the west;bring the star upon the cross-wire intersection as its altitudedecreases, moving the vernier plate only; it will now have thesame altitude as… … Fig. 94. APPLICATIONS TO HEIGHTS AND DISTANCES. 199. To determine the horizontal distance to a pointwhich is inaccessible by reason of an intervening river.—Let C be the point (Fig. 94). Measurealong the bank of the river a hori-zontal base-line AB, and select thestations A and B, in such a…
Surveying
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