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THE BELL SYSTEM TECHNICAL JOURNAL, MARCH 1954 



Table VIII — Card Drop Time in Milliseconds — 100 Cards in 

 X Bins — Card Support Bars Operating 



The overall estimate of Mean dropping time was found to be 35.1 ms. 

 We can predict therefore that the dropping time of a card chosen at ran- 

 dom from a normal translator at the beginning of its Ufe will be 35.1 

 ± 3o-' (without Runs) or between 27 and 43 ms from the \\(41 known 

 3a- limits. 



When the analysis of variance with the card support bars out is 

 examined it is found that the sampling error a'l remains stationary but 



