Excerpt from The Engineering Journal, Vol. 26: January-December, 1943 To simplify the story, I will assume that Colonel Simon had been called in at the beginning. In that case, Co'lonel Simon would first of all separate the batches of fuses from different localities, and he would group the fuses from a single locality into batches of five. All the fuses would then be set at 20 seconds; each fuse would then be timed and the average time and the range (the difference between the shortest and longest among the five) would be ...
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Excerpt from The Engineering Journal, Vol. 26: January-December, 1943 To simplify the story, I will assume that Colonel Simon had been called in at the beginning. In that case, Co'lonel Simon would first of all separate the batches of fuses from different localities, and he would group the fuses from a single locality into batches of five. All the fuses would then be set at 20 seconds; each fuse would then be timed and the average time and the range (the difference between the shortest and longest among the five) would be worked out for each batch and plotted on separate graphs. From the range chart it is possible, with the help of tables constructed by statisticians, to draw on the average time chart a pair of limits within which the dots should fall. If the points plotted for fuses made by one particular tool fall outside these limits, it is a sure indication that something is wrong with the process; the statistician cannot say what the fault is - though In some cases he can go so far as to say either that there Is only one thing wrong or else certainly several things wrong. It is for the engineer to re-examine the process and find the fault. Next, of course, similar work must be done at the other fuse settings. Once that has been done, and the whole system is in control (supposing that the accuracy is good enough for the user) much less sampling is needed; but at intervals a group should be taken and tested in the same way. Such sampling nearly always gives warning of impending trouble, before the trouble 1s so bad that the fuses would actually fail In their test. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at ... This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
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