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 472
444 HYDROGRAPHICAL SURVEYING [chap. xx. It is safe to sweep at the rate of 5 knots. One man should bestationed at each machine, with one hand on the thumb-screwcontrolhng the brake, and the other on the wue abaft themachine. The instant the sweep wire fouls a rock the kites converge; thebrake must…
Hydrographic surveying · Nautical charts
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