Notices of the proceedings at the meetings of the members of the Royal Institution of Great Britain with abstracts of the discourses . 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 inc
Notices of the proceedings at the meetings of the members of the Royal Institution of Great Britain with abstracts of the discourses . 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. h t w E Fig. 2. Fig. 3. of comparatively feeble but properly timed electrical oscillationsbeing received, the effect of the same is summed up until the the terminals of the coherer is sufficient to break down its insula-tion and cause a sigual to be recorded. In order that the two systems,transmitter and receiver, should be in tune it is necessary (if weassume the resistance to be very small or negligible) that the productof the capacity and inductance in all four circuits should be equal. It is easy to understand that if we have several stations, eachtuned to a different period of electrical vibration, and of which thecorresponding inductance and capacity at the transmitting station areknown, it will not be difficult to transmit to any one of them, withoutdanger of the message being picked up by the other stations forwhich it is not intended. But better than this we can connect tothe same vertical sending wire, through connections of differentinductance, several differently
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Keywords: ., bookauthorroyalins, bookcentury1800, bookdecade1850, bookyear1851
