This paper describes the progress which has been made in recent years in the development of methods and apparatus for the measurement of telegraph transmission in the Bell System. Such measurements play an important part in transmission maintenance work in the field and are also necessary in development work. The changes which have occurred in service requirements, particularly the large commercial development of start‐stop teletypewriter service and the effect of these changes on the technique of telegraph transmission measurement, are first discussed; then a description is given of several new measuring devices and their use.

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