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Expired
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John Simpson
Robert Simpson
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Individual
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Individual
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Publication of GB191213295ApublicationCriticalpatent/GB191213295A/en
H04M1/00—Substation equipment, e.g. for use by subscribers
H04M1/02—Constructional features of telephone sets
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Engineering & Computer Science
(AREA)
Signal Processing
(AREA)
Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo
(AREA)
Abstract
13,295. Simpson, J., and Simpson, R. June 6. Transformers.-An induction coil for telephone systems has four primary windings connected as shown, the resistances and inductances of the two pairs P, P3 and P2 P4 being equal. One of the secondary windings is connected to line, and the other to an artificial circuit of inductance and resistance. Adjustment is made so that the receiver R is unaffected by waves from the transmitter T.
GB191213295D1912-06-061912-06-06Improved Induction Coil or Transformer for the Transmission of Speech.
ExpiredGB191213295A
(en)