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The heliograph was standard military equipment as late as World War II. Wireless telegraphy developed in the early 20th century became important for maritime use, and was a competitor to electrical telegraphy using submarine telegraph cables in international communications.
The Zimmermann telegram (or Zimmermann note or Zimmermann cable) was a secret diplomatic communication issued from the German Foreign Office on January 17, 1917, that proposed a military contract between the German Empire and Mexico if the United States entered World War I against Germany.
The Telegram Crisis was a diplomatic crisis between Denmark and Germany in October and November 1942, during the German occupation of Denmark. The crisis was triggered by a telegram from King Christian X of Denmark to Adolf Hitler , acknowledging Hitler's congratulations on the occasion of the King's 72nd birthday on September 26, 1942.
The Höfle telegram (or Hoefle telegram) is a cryptic one-page document, discovered in 2000 among the declassified World War II archives of the Public Record Office in Kew, England.
On this day in 1911 the first telegram was sent around the world via a commercial service from the New York Times' office to test how fast a message could travel through a dedicated cable.
One notable example is the notification of the air raid on Pearl Harbor [4] that brought the United States into World War II. The standard military radiogram format (in NATO allied nations) is known as the 16-line message format , for the manner in which a paper message form is transcribed through voice, Morse code , or TTY transmission formats.
Transatlantic telegraph cables were undersea cables running under the Atlantic Ocean for telegraph communications. Telegraphy is an obsolete form of communication, and the cables have long since been decommissioned, but telephone and data are still carried on other transatlantic telecommunications cables .
In many English-speaking countries, a telegram delivery boy, telegraph boy or telegram boy was a young man employed to deliver telegrams, usually on bicycle. In the United Kingdom , these messengers were employed by the General Post Office ; in the United States , they worked for Western Union or other telegraph companies.