. Practical wireless telegraphy; a complete text book for students of radio communication . ed from the local cir-cuit of the first relay and another windingof the second relay like that of W-1 con-nected in its place, and so on throughoutthe series. A small milliameter M is connected inseries with the telephone and when thecurrent flow is 8 to 12 milliamperes, therelay is in the most sensitive adjustment. A Brown relay of another type is shown in Fig. 197b, where M is a microphone chamberfilled with carbon granules, the pressure on which can be carefully regulated by means ofan adjusting scre
. Practical wireless telegraphy; a complete text book for students of radio communication . ed from the local cir-cuit of the first relay and another windingof the second relay like that of W-1 con-nected in its place, and so on throughoutthe series. A small milliameter M is connected inseries with the telephone and when thecurrent flow is 8 to 12 milliamperes, therelay is in the most sensitive adjustment. A Brown relay of another type is shown in Fig. 197b, where M is a microphone chamberfilled with carbon granules, the pressure on which can be carefully regulated by means ofan adjusting screw. The vibrating tongue R is acted upon by the flux of the poles A, B,and the corresponding fluctuations of the battery B-2 not only circulate through the wind-ings W-2 and thereby amplify the vibrations of R, but these currents also pass through astep-up transformer, having the primary winding P and the secondary winding S. Thecurrent induced in S flows to the condenser C (of about 2 microfarads capacity) and throughthe head telephones. The battery B-2 is one of about 6 volts Fig. 197b—Supersensitive Brown Amplification Relay. RECEIVING CIRCUITS, DETECTORS, TUNING APPARATUS. 171
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917
