单词 | phonic wheel |
释义 | phonic wheelnoun A toothed disc or rotor of magnetic material which is caused to rotate at a constant speed by an electromagnet energized by alternating or interrupted direct current (originally derived from a tuning fork vibrating against a contact and sustained by another electromagnet). OriginLate 19th century; earliest use found in Telegraphic Journal. After French roue phonique. |
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