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 246
and at 50 pounds only 5 pounds a day. When the reservoirgets below 50 pounds pressure, it should be recharged, as it isfound that with pressures as low as 30 or 40 pounds thereadings were always too small near high-water. This minimumprobably varies with the actual depth at high-water over… … 226 HYDROGRAPHICAL SURVEYING [ciiAr. ix. FixedMark forReference Time ofObserva-tions. High andLowWaterObserva-tions. GraphicMethod. By cutting out the automatic recording arrangement andusing in its place a Bourdon gauge graduated to 300 poundspressure, the apparatus has been used on the ship at…
Hydrographic surveying · Nautical charts
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