. The 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. Fig. 2. consists of a frame of brass angles supporting on its front face fourlarge hard rubber panels and sixteen small ones. The fo
. The 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. Fig. 2. consists of a frame of brass angles supporting on its front face fourlarge hard rubber panels and sixteen small ones. The four largepanels are mounted on the upper part of the frame, and hold theswitches and the meters which it has been found desirable to providein the filament and plate circuit of each vacuum tube. The adjustableelements of the amplifier interstage shaping networks are contained inthe sixteen smaller panels mounted in the lower part of the of these panels is a complete unit, comprising either a variablecondenser, a variable resistance, or a switch for the adjustment of an 436 BELL SYSTEM TECHNICAL JOURNAL inductance. As these panels are all of the same size, it is possible ifnecessary to change radically the arrangement of the interstage net-works, or substitute entirely different ones without any difficultmechanical work on the amplifier. Each of the condensers andresistances is contained in an earthed metal box, into which it is sealedby a wa
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
