130 THE BELL SYSTEM TECHNICAL JOURNAL, JANUARY 1957 



cause of the frequency of the particular crystal assembled into the unit. 

 A manufacturing yield of 100 per cent was achieved in the assembly and 

 wiring of repeater units. 



It was necessary to calibrate the test equipment for this job very 

 closel3^ Bell Telephone Laboratories and Western Electric worked at 

 length to calibrate the testing details and the test sets for individual net- 

 works. Adjustments in components apparatus to bring the network to 

 the fine tolerances required were accomplished by minute scraping of 

 the silvered mica on a mica capacitor or removing turns from wire- 

 wound inductors. The cementing of methacrylate parts, which was a 

 troublesome item on mica capacitors and inductors, also had to be con- 

 tended with on networks. 



PACKING AND SHIPPING COORDINATION 



Repeaters were packed in Western Electric specially designed 34-foot 

 long aluminum containers, weighing 1,000 pounds. Forty of these con- 

 tainers were made by an outside firm. Fig. 9 shows two containers tied 

 down in a truck trailer. The repeaters were nested in a pocket of polj^- 

 ethylene bags containing shaped rubberized hair sections in order to 

 cushion the repeaters during their subsequent handhng and transporta- 

 tion. The instrumentation required with each case was tested, properly 

 set, and inspected prior to its use on each outgoing case. The instruments 

 were a shock recorder to register shocks in three planes, and a thermome- 

 ter to register the minimum and maximum temperatures to which the 

 repeater had been exposed. Arrangements were made with a commercial 

 trucking company to provide three specially equipped truck trailers, 

 which could be cooled by dry ice during hot weather and warmed by 

 burning bottled gas during cold weather so as to control temperature 

 within the 20-degree F. to 120-degree F. called for in the repeater spe- 

 cification. 



Appointment of a shipping coordinator supervisor added tremendously 

 to the smooth functioning of services and provided the continuing vigi- 

 lance required to protect repeaters and deliver them to the right place 

 at the right time. His responsibility was to coordinate all the shipping 

 information and arrangements from the time the item was ready for 

 packing at the Hillside plant, through all trucking arrangements to the 

 armoring factory, to the airport, to England, and to follow, with sta- 

 tistical data and reports, each enclosure until we were able to record 

 the date on which the repeater was laid or stored in a depot. 



