Proceedings of the Ire Volume 5

Proceedings of the Ire Volume 5

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1917 edition. Excerpt: ...crossing the axis of co-ordinates E at regular intervals. It has its maxima when (10) (11) and its minima when The location of the maxima and minima is given by E E sin /u The current, which is i0' at the beginning of the charge, is represented by a periodically damped curve, oscillating from one side to the other of the time axis, as shown in curves 1, 2, and 3 of Figure 7. The zeros correspond to the maxima and minima of the difference of potential: ut = kx-iL (14) These maxima and minima occur at times given by the formula w = (2fc+l)-, .-. (15) Efficiency of the Charging Circuit. Let us suppose that the spark passes at the time when the potential difference at the condenser terminals is v. The energy available for the circuit at the condenser terminals is-C02. The energy expended in the ft r charging circuit is I Eidt. The efficiency is the ratio of these two quantities: " In the case of aperiodic charging, the potential difference at the condenser terminals is always less than the electromotive force and the efficiency less than 0.5. Because of this low value of the efficiency, such a condition should be avoided in practice. In the case of "periodic charging," the potential difference is a damped period function, oscillating above and below the electromotive force E. Its maxima are given by w=(2fc + l)ff-ft, (17) which maxima become smaller as k increases. (See the curves of Figure 6.) Figure 6--Variation of Condenser Terminal Voltage as Function of Charging Time I (o =0.4) 3. Study of the Production of Musical Tones: Characteristic Conditions. The charges and discharges will take place in such a way as to produce a musical note by the successive sparks if the two following conditions are met: 1. That the...
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Product details

  • Paperback | 120 pages
  • 189 x 246 x 6mm | 227g
  • United States
  • English
  • black & white illustrations
  • 1236985591
  • 9781236985590