thumb|right|a radio operator receiving a wireless telegraphy message using a radio wave based marconi magnetic detector c.1903 wireless telegraphy is electric telegraphy done wirelessly. it is now used as a historical term for early radio telegraphy systems which communicated with radio waves, although when the term originated in the late 1800s it was also used for a variety of other experimental techniques for communicating telegraphically without wires, such as photoelectric and induction telegraphy. wireless telegraphy came to mean morse code transmitted with electromagnetic waves, initially called "hertzian waves" and by 1910 universally referred to as "radio",earlyradiohistory.us, united states early radio history thomas h. white, s e c t i o n 22, word origins-radio leading to these systems being called "radiotelegraphy". the transmission of speech (radiotelephony) began to displace wireless telegraphy by the 1920s for many applications and was the basis of public broadcasting. wireless telegraphy continued to be used for point-to-point business, governmental, and military communication, and evolved into radioteletype networks. wireless telegraphy is still used widely today by amateur radio hobbyists where it is commonly referred to as radio telegraphy, continuous wave, or just cw. ==history of development==  ===ground and water conduction=== a number of wireless electrical signaling schemes including electrical currents through water and dirt were investigated for telegraphy before practical radio systems became available. the original telegraph used two wires between two stations to form a complete electrical circuit or "loop." in 1837, however, carl august von steinheil of munich, germany found that by connecting one leg of the apparatus at each station to metal plates buried in the ground, he could eliminate one wire and use a single wire for telegraphic communication. this led to speculation that it might be possible to eliminate both w
Radio_terminology Telegraphy