THE L3 SYSTEM — QUALITY CONTROL IN MANUFACTURE 



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Fig. 12 — A control chart showing the results of using different methods of 

 measuring the minor axis of plate assembly of the 437A vacuum tube. 



A change was introduced in measuring technique at this point. The 

 plate assembhes were measured at the center with a barrel micrometer. 

 The thickness of the material was determined for each sample and sub- 

 tracted to obtain the inside dimension. The point at which the new 

 measuring method was introduced is indicated on Fig. 12. It will be noted 

 that the average value shifted downward when the change in measuring 



