Notices of the proceedings at the meetings of the members of the Royal Institution of Great Britain with abstracts of the discourses . d of electri-cal oscillations (or octaves) the twoelectrical circuits of the transmit-ting arrangement (these circuitsbeing the circuit consisting of thecondenser and primary of the trans-former and the aerial or radiatingconductor and secondary of thetransformer). Unless this conditionis fulfilled, the different periods ofthe two conductors create oscilla-tions of a different frequency andphase in each circuit, with theresult that the effects obtained arefeebl
Notices of the proceedings at the meetings of the members of the Royal Institution of Great Britain with abstracts of the discourses . d of electri-cal oscillations (or octaves) the twoelectrical circuits of the transmit-ting arrangement (these circuitsbeing the circuit consisting of thecondenser and primary of the trans-former and the aerial or radiatingconductor and secondary of thetransformer). Unless this conditionis fulfilled, the different periods ofthe two conductors create oscilla-tions of a different frequency andphase in each circuit, with theresult that the effects obtained arefeeble and unsatisfactory on a tunedreceiver. The syntonised trans-mitter is shown in Fig. 1. Theperiod of oscillation of the verticalconductor A can be increased byintroducing turns of wire, or de-creased by diminishing their num-ber, or by introducing a condenserin series with it. The condenserin the primary circuit is constructed in such a manner as to renderit possible to vary its electrical capacity. The receiving station arrangements are shown in Fig. 2. Here wehave a vertical conductor connected to earth through the primary of. 200 Mr. G. Marconi [June 13, a transformer, the secondary circuit of which is joined to the cohereror detector. In order to make the tuning more marked, I place anadjustable condenser across the coherer in Fig. 3. Now, in order toobtain best results, it is necessary that the free period of electricaloscillation of the vertical wire primary of transformer and earth con-nection should be in electrical resonance with the second circuit ofthe transformer, which includes the condenser. I stated that inorder to make the tuning more marked a condenser is placed acrossthe coherer. This condenser increases the capacity of the secondaryresonating circuit of the transformer, and in the case of a large series
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Keywords: ., bookauthorroyalins, bookcentury1800, bookdecade1850, bookyear1851
