Hydrographical surveying : a description of means and methods employed in constructing marine charts (1920)
Wharton, W. J. L. (William James Lloyd), 1843-1905, Field, Arthur Mostyn, 1855- · London : J. Murray · leaf 480
^^^^^^^ CHAP. XX.] SWEEPING OF SHEERNESS BAR Pennant marked in feet from 26 to 32 feet K 451 … Wire Pennant for raisingH^anci lowering Bar , Bay 30 feet longFig-. 107, 452 HYBROGRAPHICAL SURVEYING [chap, xx A winch was fitted in the bows of the lighter for hauHng herforward or backward. The diameter of the drum on this winchwas only 6 inches, so the rate of progress over the grovmd…
Hydrographic surveying · Nautical charts
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