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Total record count: 6269.

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Eng ID Term Definition
2361
hydrosphere
The waters of the EARTH's surface collec­tively. The 'water sphere' in comparison and contrast with LITHOSPHERE and ATMOSPHERE.
2362
hydrostatic instability
See INSTABILITY: STATIC.
2363
hydrostatic levelling
The transfer of level between two points by the use of a pipe filled with water laid on the sea bed with vertical sections at each end.
2364
hydrostatic pressure
See PRESSURE.
2365
hydrostatic stability
See STABILITY: STATIC.
2366
hygrograph
HYGROMETER which includes an arrangement for the time recording of atmosphere humidity.
2367
hygrometer
An instrument for measuring the HUMIDITY OF THE AIR. See also PSYCHROME­TER.
2368
hygrothermograph
Instrument resulting from the combination of a THERMOGRAPH and a HYGROGRAPH and furnishing, on the same DIAGRAM, simultaneous time recording... more
Instrument resulting from the combination of a THERMOGRAPH and a HYGROGRAPH and furnishing, on the same DIAGRAM, simultaneous time recording of atmospheric temperature and humidity. Also called thermohygrograph.
2369
hyperbola
An open curve with two parts, all points of which have a constant difference in distance from two fixed points called foci.
2370
hyperbolic line of position
A LINE OF POSITION in the shape of a hyperbola, determined by measuring the difference in distance to two fixed points.
2371
hyperbolic navigation
See NAVIGATION.
2372
hyperbolic number(s)
Numerical figures charac­terizing the hyperbolae of a pattern or LATTICE in a HYPERBOLIC SYSTEM of RADIOLO­CATION.
2373
hyperbolic system
Radiolo­cation system supplying HYPERBOLIC LINES OF POSITION.
2374
hypsograph
A circular instrument of the slide-rule type used to compute ELEVA­TIONS from vertical angles and horizontal distances.
2375
hypsographic (or hypsometric) curve
A curve used to indicate the proportion of the area of the surface at various ELEVATIONS above or DEPTHS below a given DATUM.
2376
hypsometer
A device for measuring HEIGHTS of land surfaces by the boiling point of water.
2377
hypsometric curve
See HYPSOGRAPHIC CURVE.
2378
hypsometric tints
A succession of shades or colour graduations used to depict ranges of ELEVATIONS. Also called gradient tints or elevation tints.
2379
hypsometry
The determina­tion of ELEVATIONS above SEA LEVEL. Generally applied to the determination of ELEVA­TIONS through the measurement of air press... more
The determina­tion of ELEVATIONS above SEA LEVEL. Generally applied to the determination of ELEVA­TIONS through the measurement of air pressure by observing the boiling point of a liquid.
2380
hysteresis
Retardation or LAG in the effect of chan­ging forces, as in ship's MAG­NETISM induced by the EARTH's MAGNETIC FIELD.