Davies, Charles, 1798-1876 · New York, Cincinnati [etc.] American book company · leaf 238
accuracy. Soundings may thus bemade along any number of known lines, and a comparison ofthe depths found, on different lines, at or near their points ofintersection, will show with what degree of accuracy the workhas been done. Sounding-lines should be made of strong cord, and dividedinto feet or… … Fig. 125. bottom adheres to the grease, and thus shows the nature of thebottom, which should be entered in the field-book, and laid down upon the map. As thecord is liable to change its length, it shouldbe compared, from time to time, with somestandard. In tide-waters, the exact time ofeach…
Surveying
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