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 424
cut to the properlength the ships blacksmith can make one in a day ; it isshown in Fig. 79. A B C is a tube about 2 feet in length, fitted at the top witha flap valve, D, working on a hinge at E. The lower part of the CHAP, xvin.] DEEP-SEA SOUNDINGS 395 tube C screws on and off, and contains a… … or cod line secured to a flat ring or grummet shown at L and passing over the stud G. A stud, K, on each side of the tube fits loosely into the slot H in the lower part of the slipping lever M H. The weight of the apparatus being taken by the sounding 396 HYDROGRAPHICAL SURVEYING [chap. xviu. wire,…
Hydrographic surveying · Nautical charts
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