Nautical words



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Hydrogap Rudder. Rudder so mounted that a gap, between its leading edge and sternpost, is formed when rudder is angled. This allows water to flow from pressure side of rudder to suction side when angled.

Hydrograph. A recording hygrometer.

Hydrographer. One who surveys oceans, seas and inland waters for the purpose of navigation and commerce; and who produces charts and sailing directions to impart the information obtained.

Hydrographer of the Navy. A senior officer - usually a flag officer - of the Royal Navy who is responsible for British hydrographic work. First to be appointed was Alexander Dalrymple, 1795. First R.N. officer was Captain Thomas Hurd, 1808.


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