. Bell telephone magazine . Figure 10. Aerial Type of Toll Cable Construction Figure 11. Placing Tape Armored Type Toll Cable Figure 12. Transporting Poles up Steep Grades on Tractors and Trailers over Private Right-of-Way Figure 13. Heavy Duty Trenching Machine. Figure 14. Earth Boring Machine and Derrick on Four-Wheel Drive TruckFigure 17. Installation of Voice-Frequency Telephone Repeaters and Associated Apparatus Figure 18. Assembly of Lonp; Haul Carrier Telephone System Terminals Figure 19. Typical Repeater Station Building DEVELOPMENTS IN TOLL TELEPHONE SERVICE careful consideration of s
. Bell telephone magazine . Figure 10. Aerial Type of Toll Cable Construction Figure 11. Placing Tape Armored Type Toll Cable Figure 12. Transporting Poles up Steep Grades on Tractors and Trailers over Private Right-of-Way Figure 13. Heavy Duty Trenching Machine. Figure 14. Earth Boring Machine and Derrick on Four-Wheel Drive TruckFigure 17. Installation of Voice-Frequency Telephone Repeaters and Associated Apparatus Figure 18. Assembly of Lonp; Haul Carrier Telephone System Terminals Figure 19. Typical Repeater Station Building DEVELOPMENTS IN TOLL TELEPHONE SERVICE careful consideration of suitable maintenance practises. Pre-ventive measures are continually being developed and appliedto the cable plant to aid this work. Interesting in this con-nection is the application of continuous gas pressure and asso-ciated alarm gages for the detection of cable sheath failures. Other measures have been taken to minimize maintenancetroubles on the toll cables. For example, much study hasbeen given to the matter of securing the proper tension in theaerial cable suspension strand and a proper relation betweenthe strand and cable tensions in order to obviate buckling ofthe cable due to temperature changes. Also, in placing cablesin the usual multiple tile
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Keywords: ., bookauthoramerican, bookcentury1900, bookdecade1920, bookyear1922
