This manual is a basic textbook covering the fundamentals of the circuits and equipment used in United States Army teletypewriter land-line and radio networks throughout the world. It may be used as a textbook or as a reference manual. It is assumed that students and others using this manual are familiar with basic electrical theory and the ordinary use and operation of simple parts such as gears, bearings, levers, rollers, cams, etc. - The material in this manual is used in training teletypewriter mechanics, SSN 239. Presented in a single manual is all of the text required to familiarize the student mechanic with the necessary broad practical reasoning of how the many different circuits and equipments function.
DesignationTM 11-680
EditionJul 1942
StatusSuperseded
Pages247
FunctionComms Signal
CollectionHistoric
Public domain (U.S. Government work)