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107 



ms that may be recorded by punched holes. 



short notice, the provision of cards capable of being readily coded in the 

 field became another objective. 



It was estimated that from five to ten per cent of the cards used in 

 nationwide dialing would have to be replaced annually because of routing 

 changes, that on the average a card would be selected for routing pur- 

 poses about one million times before its replacement due to routing 

 changes would be necessary and that the average routing change interval 

 would be from five to ten years. It was recognized that in the course of 

 this period, cards might have to be loaded and unloaded several times. 

 These facts established ruggedness consistent with high-speed opera- 

 tion as still another objective. 



Ruggedness indicated the use of metallic cards. The comparatively 

 large number of input tabs and output holes required made for sub- 

 stantial size. These considerations together with the comparatively 

 large number of cards that are to be stacked together made it obvious 

 that considerable weight would have to be contended with. Yet it was 

 known that highspeed operation is mandatory. These conditions sug- 

 gested that the cards be made from magnetic material so that their 

 manipulation might be assisted by suitably applied magnetic forces 

 such as may be developed by the pull-up and pull-down magnets that 

 already have been referred to and illustrated. Thus provision for the use 

 of cards made from magnetic material became an added objective. 



