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Eng ID | Term | Definition |
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2181 | gyro sextant | See SEXTANT. |
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2182 | hachures | Short lines drawn on a CHART or MAP for representing RELIEF. These lines are drawn in the direction of the SLOPE and intensified on the shad... more |
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2183 | hack watch | See WATCH. |
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2184 | hail | PRECIPITATION of small balls or pieces of ICE (HAILSTONES) with a diameter ranging from 5 to 50 mm (0.2 to 2.0 in) or sometimes more, fallin... more |
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2185 | hailstone | Globule or piece of ICE, with a diameter varying between 5 and 50 mm or even more, the fall of which constitutes HAIL. Hailstones consist al... more |
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2186 | halation | In PHOTOGRAPHY, a spreading of a photographic IMAGE beyond its proper boundaries, due especially to REFLECTION from the side of the film or... more |
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2187 | half byte | 4 bits of a 8 BIT BYTE; usually used to encode the figures 0....9. |
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2188 | half convergency | See ARC TO CHORD CORRECTION. |
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2189 | half tide | See TIDE. |
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2190 | half tide level | The LEVEL midway between MEAN HIGH WATER and MEAN LOW WATER. It may differ slightly from MEAN SEA LEVEL. Also called mean tide level. |
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2191 | halftone | In PHOTOGRAPHY or printing, a technique in which the solid IMAGE is broken up by the use of a screen into evenly spaced dots of equal densit... more |
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2192 | halo (solar, lunar) | Group of optical PHENOMENA, in the form of rings, arcs, pillars or bright spots, produced by the REFRACTION or REFLECTION of light by ice cr... more |
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2193 | halo: large (halo of 46°) | HALO much less frequent and always less luminous than the SMALL HALO. It comprises a faintly luminous ring centered on the SUN or MOON and h... more |
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2194 | halo: small (halo of 22°) | White, or mostly white, luminous ring of 22° radius with the luminary at its centre. The small halo shows a faint red fringe on the inside a... more |
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2195 | halocline | A vertical GRADIENT of salinity (which is usually positive) in some LAYER of the body of water, which is appreciably greater than the GRADIE... more |
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2196 | hand lead | See LEAD. |
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2197 | hand lead sounding | See SOUNDING. |
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2198 | hanging compass | See COMPASS. |
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2199 | hanging traverse | See TRAVERSE: OPEN. |
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2200 | harbour (or harbor) | A natural or artificially improved body of water providing protection for vessels, and generally ANCHORAGE and docking facilities. See also... more |