STATISTICAL CONTROL OF PRODUCTION*

Abstract

FOR a number of years I had been interested in the general question of tolerances, first from the point of view of pure science and later in its more practical aspects. My interest in this subject was very much focused when I came to the National Physical Laboratory, where I found that work was being done on the actual verification of manufacturing and inspection gauges ; this work, of course, deals with the subject in an enhanced degree—squared, so to speak, because there is not only to be considered the tolerance of the work, but also the tolerances on both the go and the not-go gauges which are to check the work.