. The Bell System technical journal . distorting the signal and the rate at which it is dissi-pated by the shunt if no further contacts take place is still should be noted that these rates of charge and discharge, whileadjustable, need not bear any accurate relation to the shape of thesignal itself. The correction is usually applied rapidly enough so thatthe zero is brought back to normal within the duration of about fivesignal pulses and the proper operation of the circuit prevents the zerofrom passing beyond limits about five per cent of the signal amplitudeeither side of the norma
. The Bell System technical journal . distorting the signal and the rate at which it is dissi-pated by the shunt if no further contacts take place is still should be noted that these rates of charge and discharge, whileadjustable, need not bear any accurate relation to the shape of thesignal itself. The correction is usually applied rapidly enough so thatthe zero is brought back to normal within the duration of about fivesignal pulses and the proper operation of the circuit prevents the zerofrom passing beyond limits about five per cent of the signal amplitudeeither side of the normal position. A somewhat simplified circuit ofthe relay control unit which includes the zero corrector is shown inthe lower part of Fig. 1. ^A system in common use is due to S. G. Brown (British Patent No. 6,275,February 20, 1913). Other systems have been invented by D. K. Gannett and , U. S. Patent No. 1,548,878, Aug. 11, 1925, and R. C. Mathes, U. No. 1,295,553, February 25, 1919. 434 BELL SYSTEM TECHNICAL JOURNAL. SUBMARINE TELEGRAPH CABLES 435 Mechanical Details of Amplifier and Relay Control Desk The construction of the amplifier and relay control desk is shownin the accompanying figures. Fig. 2 is a front and Fig. 3 a back viewof the amplifier in its cabinet, Fig. 4 is a back view of the panel frameremoved from the cabinet and Fig. 5 is a front view of the relay controlpanel associated with the amplifier. Mechanically the amplifier
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
