| 单词 |
sparker |
| 释义 |
sparker
[f. spark n.1 or v.1 + -er.]
1. A spark-arrester.
1864Webster, Sparker, a contrivance [in a locomotive-chimney] to prevent the escape of sparks, while it allows the passage of gas.
2. A kind of miniature firework.
1908Daily Chron. 31 Oct. 3/3 When discharged the sparker created a flare and emitted sparks.
3. A powerful form of sonar apparatus used to investigate solid structures underlying sediment on the sea bed.
1961Ann. Reg. 1960 406 The whole area was surveyed by the newly developed ‘sparker’ technique, an extension of the echo-sounding method used for charting the sea⁓bottom. The sparker used an intense sound source (a spark) which enabled the sound wave to penetrate the sea bottom. The sound waves were reflected from the interfaces between different kinds of rock. 1969J. W. Mavor Voyage to Atlantis ii. iii. 84 The ‘sparker’ and line hydrophone for listening to the reflected sound signals were the most powerful in the world but required a depth of 60 feet and 150 yards of towline astern. 1974Nature 26 Apr. 745/1 An 8 kJ sparker was also used. |
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