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BELL SYSTEM TECHNICAL JOURNAL 



incorporated in its design many improvements in order to improve 

 cable quality, and also to reduce that part of the manufacturing cost.» 

 It consists of fifteen horizontal driers, each 40 ft. in length and 1\ ft. in 

 diameter, and one horizontal drier 40 ft. in length and 10 ft. 4 in. in 

 diameter (Fig. 15). The former driers are used for the ordinary toll 



Fig. 15 — -Vacuum driers. 



cable, while the latter single tank is used for drying submarine cables of 

 long lengths. 



The drying ovens are arranged so that the loading end is located in 

 the cable room proper, and the unloading end in the dehumidified 

 cable storage room (Fig. 17). To prevent the exfiltration of dry air 

 from the storage room through joints between oven and brick wall a 

 novel type of seal is used. This consists of a flexible sheet of copper, 

 to allow for tank expansion, fastened and gasketed on the inner cir- 



8 For further discussion and detailed factory layout of this system, see paper by 

 J. C. Hanley, Mech. Engg., March, 1931. 



