A high-speed direct-scanning facsimile system

A facsimile system capable of sending 80 complete standard size letters per hour is described. Direct scanning is employed at both the transmitter and the recorder, making the transmitted message immediately available at the receiving terminal. Servoloops around the 1,800-rpm scanning motors provide the synchronous precision required at the speeds involved. Phasing is accomplished by controlling the phase of the motor driving voltage at the recorder. The equipment is automatic and under the complete control of the sending operator.