. The Bell System technical journal . Fig. 13 — Pulse stretcher and channel detector circuit,. i Fig. 14 — Administration unit. Three eo-ax leads entering under shelf bringi]A, B and F pidses from translator. Cable leading to plug with bail-handle resting;on shelf serves to connect writing amplifier output to magnetic heads in translatori|Bottom cable connects to 60-cycle source which supplies all power, 740 MAGNETIC DRUM TRANSLATOR FOR TOLL SWITCHING OFFICES 741 former designed for the audio frequency range, and a cold-cathode gastube. The starter-anode of the gas tube has a dc bias of about
. The Bell System technical journal . Fig. 13 — Pulse stretcher and channel detector circuit,. i Fig. 14 — Administration unit. Three eo-ax leads entering under shelf bringi]A, B and F pidses from translator. Cable leading to plug with bail-handle resting;on shelf serves to connect writing amplifier output to magnetic heads in translatori|Bottom cable connects to 60-cycle source which supplies all power, 740 MAGNETIC DRUM TRANSLATOR FOR TOLL SWITCHING OFFICES 741 former designed for the audio frequency range, and a cold-cathode gastube. The starter-anode of the gas tube has a dc bias of about +24 voltswith respect to its cathode to reduce the value of pulse voltage requiredto ionize it. When +130 volt battery is applied via the winding of thechannel to the main anode of the gas tube, ionization establishedin the starter gap by the pulse stretcher signal will transfer to the maingap and cause the relay to operate. Closure of one of the relay make-contacts serves to divert the winding current from the gas tube directlyto ground, thereby extinguishing the tube and prolong
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
