| 单词 | phonic wheel |
| 释义 | > as lemmasphonic wheel phonic wheel n. [after French roue phonique (P. Lacour 1878, in Compt. rend. 87 500)] 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). ΘΚΠ society > occupation and work > equipment > machine > machines which impart power > motor > [noun] > other parts of gear1814 controller1836 phonic wheel1878 reverser1879 rotor1892 stator1892 brush-holder1894 interpole1907 phonic motor1924 1878 Telegraphic Jrnl. 6 476/2 M. Paul la Cour has succeeded in causing a phonic wheel to maintain its uniform rate of rotation when acted upon by an accelerating or retarding force of one kilogramme-metre-minute. 1956 IRE Trans. Electronic Computers 5 159/1 The clock frequency is 50 kc, obtained from a phonic wheel on the drum. 1995 Railway Age (Nexis) Sept. 79 For train location, SACEM uses phonic wheels, which are equivalent to a tachometer, communicating with wayside beacons. phonic wheel 1. Of or relating to sound; acoustic. Now chiefly in phonic motor, phonic wheel ( Compounds). ΘΚΠ the world > matter > physics > science of sound > [adjective] acoustic1640 acoustical1803 phonic1823 magneto-acoustic1903 audio1960 1823 C. Wheatstone in Ann. Philos. New Ser. 6 81 On the Phonic Molecular Vibrations. 1858 R. G. Mayne Expos. Lexicon Med. Sci. (1860) 945/2 The point where is found either the person who speaks, or the body which emits the sound is called the phonic centre. 1878 Smithsonian Inst. Rep. 492 The axis of the phonic ray will be deflected upwards. 1998 Nature 23 July 327/2 A complementary realization of the ‘musical’ principles governing the ‘molecular vibrations’ in both light and sound was provided by Wheatstone's. ‘Kaleidophone or Phonic Kaleidoscope’. < as lemmas |
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