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Eng ID | Term | Definition |
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4141 | quadrantal correctors | Masses of SOFT IRON placed near a MAGNETIC COMPASS to correct for QUADRANTAL DEVIATION. Spherical quadrantal correctors are called quadran... more |
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4142 | quadrantal deviation | See DEVIATION. |
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4143 | quadrantal sphere | See QUADRANTAL CORRECTORS. |
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4144 | quadrature | An ELONGATION of 90° usually specified as east or west in accordance with the direction of the body from the SUN. The MOON is at quadrature... more |
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4145 | quadripod | A four-legged stand for TRIANGULATION, SIGNALS, etc. |
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4146 | quality control | All procedures which ensure that the product meets certain standards and specifications. |
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4147 | quality of the bottom | See BOTTOM: NATURE OF. |
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4148 | quarantine anchorage | An area where a vessel anchors when satisfying quarantine regulations. |
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4149 | quarantine buoy | A BUOY marking the location of a QUARANTINE ANCHORAGE. |
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4150 | quarter-diurnal tide(s) | See TIDE. |
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4151 | quartering sea | WAVES moving in a direction approximately 45° from a vessel's HEADING, striking the vessel on the quarter. |
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4152 | quarter point | The fourth of the distance from one POINT of the COMPASS to another, equivalent to about two DEGREES and forty-nine MINUTES. |
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4153 | quartz | Crystalline silica. In its most common form it is colourless and transparent, but it takes a large variety of forms of varying degrees of op... more |
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4154 | quartz clock | See CLOCK: CRYSTAL. |
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4155 | quartz horizontal magnetometer | See MAGNETOMETER. |
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4156 | quay | A WHARF approximately parallel to the SHORELINE and accommodating ships on one side only, the other side being attached to the SHORE. It i... more |
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4157 | quayage | A comprehensive term embracing all the structures in a PORT alongside which vessels can lie. |
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4158 | quenching | The great reduction in underwater sound transmission or reception resulting from absorption and SCATTERING of sound energy by air bubbles en... more |
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4159 | quicksand | A loose mixture of SAND and water that yields to the pressure of heavy objects. Such objects are difficult to extract once they begin sinkin... more |
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4160 | quintant | A double-reflecting instrument for measuring angles. It is similar to a SEXTANT, but has an arc of 72°. |