What is automatic telegraph system?
I am not sure if there is a modern definition but RTTY would be an automatic telegraphy system. The name would stand for Radio TeleType but Teletype is a trade name so the RTTY was used instead. Landline teleprinter operations began in 1849 when a circuit was put in service between Philadelphia and New York City. Emile Baudot designed a system using a five unit code in 1874 that is still in use today. Teleprinter system design was gradually improved until, at the beginning of World War II, it represented the principal distribution method used by the news services. Radioteletype evolved from earlier landline teleprinter operations. Commercial RTTY systems were in active service between San Francisco and Honolulu as early as April 1932 and between San Francisco and New York City by 1934. The US Military used radioteletype in the 1930s and expanded this usage during World War II. The Navy called radioteletype RATT and the Army Signal Corps called radioteletype SCRT, an abbreviation of Sin
