. An elementary manual of radiotelegraphy and radiotelephony for students and operators . t little or no effectis produced in the secondary circuit, as judged by the emission of iiS RADIOTELEGRAPHY light by the glow lamp, whilst the two circuits are out of is, however, possible to so adjust the inductance and tune thecircuit that the little lamp glows brilliantly, thus indicating thatthe secondary current is immensely increased by tuning, but isextinguished by a very small alteration in the inductance eitherof the primary or the secondary circuit. This experiment illustratesvery well t
. An elementary manual of radiotelegraphy and radiotelephony for students and operators . t little or no effectis produced in the secondary circuit, as judged by the emission of iiS RADIOTELEGRAPHY light by the glow lamp, whilst the two circuits are out of is, however, possible to so adjust the inductance and tune thecircuit that the little lamp glows brilliantly, thus indicating thatthe secondary current is immensely increased by tuning, but isextinguished by a very small alteration in the inductance eitherof the primary or the secondary circuit. This experiment illustratesvery well the effect of syntony in exalting the secondary can be conducted also with undamped oscillations set up in theprimary circuit by the use of a spark gap, but it is found thatwhen using undamped oscillations the tuning, as it is called, ismuch sharper than with damped oscillations. The reason for thisis generally as follows:— The current set up in the secondary circuit is determined as tostrength by several factors. Let J stand for the root-mean-square value of the secondary. Fig, 25. current, that is the value which would be indicated by a correcthot-wire ammeter inserted in the secondary circuit. Then J^ iscalled the mean square value of the oscillations, or, by some Germanwriters, the integral effect of the oscillations. Let Ci be thecapacity in the primary circuit and C2 that in the secondarycircuit, and Vi the potential to which the primary condenser ischarged, and let k be the coefficient of coupling of the circuits, andfurthermore let Si and §2 be the logarithmic decrements of thetwo circuits. Then when the circuits are adjusted to resonanceso that they both have the same time period of oscillation n thesecondary current comes to a maximum value. We shall denotethis maximum value by J,,,^„ so that J\,„ is the mean-square UNDA.\fPED ELECTRIC OSCILLATIONS 119 or effective value of the current in the secondary circuit when it Lstuned to the primary. It was sh
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1916
