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 231
URVEYING [cHAr. viii. Alterna-tiveMethod. winch, and to the derrick or davit aft. A shp is attached tothis with a broad projecting palm of sheet-iron to the catch(see Fig. 57). To this the lead is attached, and hove forward by the winch.When up to the boom, the rounding-line is let go, and… … a. The broad palm b. A spring to keep slip in place. There are varieties in the detail of the fittings, accordingto different ideas. By dropping the lead well away from the ship, the chancesof the lead-line fouling the screw, if the helm is over, aremuch lessened. Another plan has recently been…
Hydrographic surveying · Nautical charts
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