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Eng ID Term Definition
2201
harbour: inner
The part of a HARBOUR more remote from the SEA, as contrasted with the OUTER HARBOUR. These expressions are usually used only in a HARBOUR t... more
The part of a HARBOUR more remote from the SEA, as contrasted with the OUTER HARBOUR. These expressions are usually used only in a HARBOUR that is clearly divided into two parts, as by a narrow passa­geway or man-made structures. The inner harbour gene­rally has additional protection and is often the principal berthing area.
2202
harbour: island
A HARBOUR formed, or mainly protected, by ISLANDS.
2203
harbour: outer
The part of a HARBOUR towards the SEA, through which a vessel enters the INNER HARBOUR.
2204
harbour: tidal
A HARBOUR affected by the TIDES, in distinction from a HARBOUR in which the water level is maintained by CAISSONS or gates.
2205
harbour chart
See CHART.
2206
harbour line
The line beyond which wharves and other structures cannot be extended.
2207
harbour master
A local official who has charge of mooring and berthing of vessels, collecting harbour fees, etc.
2208
harbour reach
The reach of a winding RIVER or ESTUARY which leads directly to the HARBOUR.
2209
harbour works
Permanent man-made structures built along the coast which form an integral part of the harbour system such as jetties, moles, quays or other... more
Permanent man-made structures built along the coast which form an integral part of the harbour system such as jetties, moles, quays or other port facilities, coastal terminals, wharves, breakwa­ters, sea walls, etc.
2210
hard bottom
The seafloor not covered by unconsolid­ated SEDIMENT.
2211
hard iron
Iron or steel which is not readily mag­netized by induction, but which retains a high per­centage of the MAGNETISM acquired. The opposite ... more
Iron or steel which is not readily mag­netized by induction, but which retains a high per­centage of the MAGNETISM acquired. The opposite is SOFT IRON.
2212
hardware
All physical material components of a compu­ter system as e.g. central processing unit (CPU), peripheral devices etc.. May also include ind... more
All physical material components of a compu­ter system as e.g. central processing unit (CPU), peripheral devices etc.. May also include individual chips.
2213
harmonic
A sinusoidal quantity having a FREQUENCY that is an integral multiple of the FREQUENCY of a periodic quantity to which it is related.
2214
harmonic analysis of tide
The mathematical process by which the observed TIDE at a place is analyzed by breaking it down into a number of constituent tides of simple ... more
The mathematical process by which the observed TIDE at a place is analyzed by breaking it down into a number of constituent tides of simple periodic forces, each having a fixed PERIOD. In this process the SUN and MOON are replaced by a number of hypothetical tide-producing bodies which move in circular ORBITS around the EARTH in the plane of the EQUATOR. See HARMONIC CONSTANTS, HARMONIC CONSTITU­ENT.
2215
harmonic constants
The AMPLITUDE and EPOCHS of the HARMONIC CON­STITUENT of the TIDE, or TIDAL CURRENT at any place.
2216
harmonic constituent
One of the harmonic elements in a mathematical expression for the TIDE-PRODUCING FORCE, and in corresponding formulae for the TIDE or TIDAL ... more
One of the harmonic elements in a mathematical expression for the TIDE-PRODUCING FORCE, and in corresponding formulae for the TIDE or TIDAL CURRENT. Each constituent represents a periodic change or variation in the RELATIVE POSITIONS of the EARTH, SUN and MOON. Also called tidal constituent or component.
2217
harmonic prediction
In tidal terminology, the method of predicting TIDES and TIDAL CURRENTS by combining the HARMONIC CONSTITUENTS into a single curve. The work... more
In tidal terminology, the method of predicting TIDES and TIDAL CURRENTS by combining the HARMONIC CONSTITUENTS into a single curve. The work was usually done mechanically by a machine designed for this purpose, called a TIDE PREDICTING MACHI­NE; nowadays the work is done by COMPUTERS.
2218
hatching
The drawing or engraving of fine, parallel or crossed lines to show SHADING.
2219
haven
An enclosed and protected HARBOUR.
2220
Hayford's spheroid
The SPHEROID based upon an inve­stigation made in 1909 by Hayford, a geodesist of U.S. Coast & Geodetic Survey, using the large TRIANGULA­... more
The SPHEROID based upon an inve­stigation made in 1909 by Hayford, a geodesist of U.S. Coast & Geodetic Survey, using the large TRIANGULA­TION NET then existing in the U.S. A., and taking into account the inequal density of the EARTH's CRUST. The Geodetic and Geophysical Union (now the International Union of Geodesy and Geophys­ics) adopted in 1924 the Hayford's spheroid (with some slight modifica­tions) as the INTERNATIONAL ELLIPSOID OF REFERENCE.