| 单词 | box relay |
| 释义 | > as lemmasbox relay box relay n. Telegraphy (now historical) a portable relay (relay n.1 4a) having its coils enclosed in a box. ΚΠ 1867 Telegrapher 15 Mar. 258/1 (advt.) Small Box Relay, $16. Same in Rosewood, $17. 1926 Telegr. Operator: Students Man. 1925 (U.S. Army Training Man. No. 28) xxxiii. 189 The objections to the box relay are that, as the armature is heavy, it has more inertia and requires more current to operate than a common relay. 1993 M. McCutcheon Writer's Guide Everyday Life 1800s ii. 76 He [sc. the telegrapher on transcontinental trains] carried a device called a box relay, which could be attached to the telegraph line that ran along the tracks to call for help in the event of derailments, breakdowns, robberies, etc. < as lemmas |
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