| 单词 | mercury break |
| 释义 | > as lemmasmercury break mercury break n. Electrical Engineering a device for varying the current in an induction coil by means of a fine jet of mercury with which moving electrodes are alternately in and out of contact. ΚΠ 1889 Proc. Royal Soc. 1888–9 45 285 The coil is worked by a slow mercury break. 1920 Whittaker's Electr. Engineer's Pocket-bk. (ed. 4) 123 The motor mercury break effects the rapid interruption of the current in the primary by means of a fine mercury jet playing on a rotating toothed wheel. When a tooth is in line with the jet, the circuit is made; when a space is in line, the circuit is broken. 1941 S. R. Roget Dict. Electr. Terms (ed. 4) 227/2 Mercury Break or Interrupter, a contact-breaker for induction coils in which contact is made between moving metallic contacts and a jet of mercury provided by a small centrifugal pump driven by the same motor as the contacts. < as lemmas |
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