The London, Edinburgh and Dublin philosophical magazine and journal of science . Reference to figure 2 will elucidate the phase this figure the upper curve relates to fork A and the lowerto fork B. Positive values of the ordinates relate to positivedisplacements in the sense of approach to the electromagnet. Fig. When A has moved through J of its cycle of movements,and the displacement is a negative maximum au it makescontact for Bs electromagnet, which gives a momentary im- maintaining Tuning-forks by Electricity. 219 pulse just as B has phase 0°. A quarter of a period later
The London, Edinburgh and Dublin philosophical magazine and journal of science . Reference to figure 2 will elucidate the phase this figure the upper curve relates to fork A and the lowerto fork B. Positive values of the ordinates relate to positivedisplacements in the sense of approach to the electromagnet. Fig. When A has moved through J of its cycle of movements,and the displacement is a negative maximum au it makescontact for Bs electromagnet, which gives a momentary im- maintaining Tuning-forks by Electricity. 219 pulse just as B has phase 0°. A quarter of a period later Bmakes contact (b\), and gives an impulse to A just when Asphase is 0°. The arrows indicate the instant and direction ofthe forces. It is assumed that the retardation due to self-induction is small, as compared with the period of the forks :and this may easily be made so, firstly, by employing onlyshort internal electromagnets with laminated cores, and,secondly, by interposing sufficient inductionless resistance inthe circuit. Another point of some importance in the construction ofelectrically sustained forks is that the contacts should be veryfirm, and should be made much nearer the hilt of the forkthan is usual in these instruments. When the stylus is nearthe outward end of the prong there is much greater amplitudeof
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectscience, bookyear1840
