. The Bell System technical journal . rs in both directions of transmission, led to the use ofracks along opposite sides of the hut with a splicing pit under the floormade accessible by trap doors in the floor between the lines of this case, the cable terminals are installed at the bottom of the rackswith their stubs dropped directly through the floor slab into thesplicing pit. The racks in the hut are seven feet high and a ceilingheight of eight feet is used. Figures 12, 13, 14, and 15 are pictures of atypical repeater station, typical filter hut, and the special hut atAustin. 358 BE
. The Bell System technical journal . rs in both directions of transmission, led to the use ofracks along opposite sides of the hut with a splicing pit under the floormade accessible by trap doors in the floor between the lines of this case, the cable terminals are installed at the bottom of the rackswith their stubs dropped directly through the floor slab into thesplicing pit. The racks in the hut are seven feet high and a ceilingheight of eight feet is used. Figures 12, 13, 14, and 15 are pictures of atypical repeater station, typical filter hut, and the special hut atAustin. 358 BELL SYSTEM TECHNICAL JOURNAL For correct operation of the equipment, temperature limits of 32 to110 degrees Fahrenheit are desirable. Also, it is necessary that therebe no precipitation of moisture on wiring or equipment. To maintainthe desired conditions, each of the huts is equipped with a 2 kw. blowertype electric heater arranged to operate at low temperature or highrelative humidity, but with operation blocked when the temperature. Fig. 13—Equipment in unattended repeater station. reaches 95 degrees. Each new unattended repeater station is equippedwith a 4 kw. heater similarly controlled, and, on account of the heatdissipation of power plant and vacuum tubes, also has forced ventila-tion which is operative under conditions of high temperature. Thesystem of forced ventilation consists of spun glass intake filter, exhaustfan, electric solenoid controlled shutters at intake and exhaust, andthermostat, and is interconnected with the office alarms to prevent fanoperation in case of fire. SOME APPLICATIONS OF TYPE 7 CARRIER SYSTEM 359
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
