International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 102
engthexposed. A hole is bored in the center of the top of thepost and a flagpole set in it. The pole can be pulled outand a transit set directly over the station. Each stationshould be distinguished by the combination of colors on theflag, and the number of the station should be distinctlymarked on… … Fig. 305. The location of buoys and soundings is illustrated in Fig.305. The stations A and B are located and their distanceapart known. A transit is set up at each station and back-sighted to a rod at the other; the vernier plate is then un-damped and the leadsman in the boat is carefully…
Railroad engineering
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