. The Bell System technical journal . 100 24 32 40 NUMBER OF TESTS. 24 32 40 NUMBER OF TESTS Fig. 2—Typical growth curves Fig. 2 shows several typical growth curves that were obtained inthe process of training new crew members. In this process the newmembers observe continually on various circuits until the resultscompare favorably with the results that are obtained by experiencedobservers. In such tests, experienced speakers are used. The aver-ages for two new observers, of the results that were obtained on ahigh grade circuit, are shown by Curve I. Two speakers were usedin these tests. A lim
. The Bell System technical journal . 100 24 32 40 NUMBER OF TESTS. 24 32 40 NUMBER OF TESTS Fig. 2—Typical growth curves Fig. 2 shows several typical growth curves that were obtained inthe process of training new crew members. In this process the newmembers observe continually on various circuits until the resultscompare favorably with the results that are obtained by experiencedobservers. In such tests, experienced speakers are used. The aver-ages for two new observers, of the results that were obtained on ahigh grade circuit, are shown by Curve I. Two speakers were usedin these tests. A limited amount of testing was done by the observersprior to the above tests. Upon the completion of the tests of Curve Iabout 30 or 40 additional tests were made on various circuits. A53 822 BELL SYSTEM TECHNICAL JOURNAL series of tests, in which several speakers were used, were then under-taken on a carbon transmitter circuit. In Curve II the averages forthe two observers, of results on two voices, are shown. Three tofour weeks time was spent by the observers in
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