This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1917 Excerpt: ...adjusted so that only once in each alternation of the e.m.f. from the generator does the gap break down and the oscillating discharge occur. ...
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1917 Excerpt: ...adjusted so that only once in each alternation of the e.m.f. from the generator does the gap break down and the oscillating discharge occur. The group frequency is then twice the frequency of the alternating-current supply. The two frequencies of the natural oscillations in the coupled circuits may be found by the method of page 76. The frequencies may be determined experimentally by coupling a wave meter to the tuned circuits. When the frequency of the wave meter is approximately that of either of the two oscillations under consideration there will be a peak in the current-frequency curve obtained by it.1 If the coupling is close, the curve will be of the form shown by the full line in Fig. Fig. 53.--Resonance curves for circuit of Fig. 52. 53. If the coupling is loose, the curve will be found to be similar to that of the dotted line in Fig. 53. Curves showing the currents in the primary, that is, branch 1, and in the secondary or branch 2 are given in Fig. 54. Quenched-gap Excitation.--If a circuit of but a single degree of freedom is excited there will be of course only one frequency of natural oscillation. If, therefore, in the coupled circuits 1 and 2 of Fig. 52 it is possible to arrange that after excitation has occurred branch 1 is automatically opened so that no current flows in it then except for the instant the current flows in branch 1 there should be developed in branch 2 but a single frequency oscillation. This is accomplished by using for the spark gap 1 For a further discussion of this matter see Chapter VIII, pages 132-137. a so-called "quenched gap," that is a gap of small length which offers a high resistance to the current which flows after a spark has passed across it. The current in the primary when using a Fig. 55.--Effect of...
Fair. No Jacket. 8vo-over 7¾"-9¾" tall. Pages are clean and unmarked. Book shows some use. Some crayon scribbling on back free end papers. Cover corners and edges are lightly rubbed. Binding is tight. 205pp. Reading copy.
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