. The Bell System technical journal . Fig. 25—Telegraph service-monitoring set, test design. and special investigations. Among these devices are start-stop andsynchronous distortion indicators employing flashes of Hght to indicatethe position of the transitions of teletypewriter signals and a photo-graphic recorder of teletypewriter signal transition points. A syn-chronous flashing indicator in combination with a distributor arrangedto supply teletypewriter signals with adjustable bias is in use in shoptests of teletypewriters and in the laboratory. Acknowledgment In the development of the pra
. The Bell System technical journal . Fig. 25—Telegraph service-monitoring set, test design. and special investigations. Among these devices are start-stop andsynchronous distortion indicators employing flashes of Hght to indicatethe position of the transitions of teletypewriter signals and a photo-graphic recorder of teletypewriter signal transition points. A syn-chronous flashing indicator in combination with a distributor arrangedto supply teletypewriter signals with adjustable bias is in use in shoptests of teletypewriters and in the laboratory. Acknowledgment In the development of the practical telegraph transmission meas-uring devices, which have been described, many members of the BellSystem have contributed valuable ideas and effort. The authorswish to express their appreciation of the cooperation they havereceived. APPENDIX General This appendix considers characteristic distortion of telegraph signalsfrom the standpoint of the development of simple and convenienttesting technique for application primarily to ci
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