... is a historical term for what's now known as radio. It was originally used for any experimental technique for communicating telegraphically without wires, including photoelectric and induction telegraphy. The term 'radio' was in common use by 1910, and the term 'wireless telegraphy' has been largely replaced by the more modern term 'radiotelegraphy'. The transmission of speech (radiotelephony) began to displace wireless telegraphy by the 1920s for many applications, making possible radio broadcasting.
The signals that led to the capture of Crippen and Le Neve were sent using Morse code.
© Haydn Thompson 2017