In addition, rapidly moving armies in the field could not have fought effectively without radiotelegraphy because they moved more rapidly than telegraph and telephone lines could be erected.
32.
By the 1920s, there was a worldwide network of commercial and government radiotelegraphic stations, plus extensive use of radiotelegraphy by ships for both commercial purposes and passenger messages.
33.
It was used from about 1910 in a few " superpower " longwave radiotelegraphy stations to transmit transoceanic message traffic by Morse code to similar stations all over the world.
34.
Morse code has not been used on French ships since 1997 and on U . S . ones since 1999 However, an FCC certificate for radiotelegraphy may still be obtained.
35.
With the introduction of " wireless " ( radio ) by Guglielmo Marconi in the early 1900s Morse code was quickly adapted to the new radio technology giving rise to radiotelegraphy.
36.
Radiotelegraphy was also extensively used by warplanes, especially by long-range patrol planes that were sent out by those navies to scout for enemy warships, cargo ships, and troop ships.
37.
URSI's original objective ( to encourage " scientific studies of radiotelegraphy, especially those which require international cooperation " ) has been broadened to include all radio science, from optical domain.
38.
URSI was officially created in 1919, during the Constitutive Assembly of the International Research Council ( now ICSU ), based on the earlier ( 1913 1914 ) when the only radio communication system was radiotelegraphy.
39.
By 1910 communication by Hertzian waves was universally referred to as " radio ", and the term wireless telegraphy has been largely replaced by the more modern term " "'radiotelegraphy "'".
40.
The station was to carry out operations including participation in exercises through machine gun shooting, dropping of dummy bombs and dummy mines, aerial photography, reconnaissance along the coast from Farsund to Arendal, and radiotelegraphy.
