1 The terms duple, triple, and quadruple refer to the number of beats in a measure. 2  The term simple means that each of these beats can be broken into two notes. 3  For example, 2/4 time is classified as simple duple.
After Hertz's work many people were involved in further development of the electronic components and methods to improve the transmission and detection of electromagnetic waves. Around the turn of the 20th century Guglielmo Marconi, developed the first apparatus for long distance radio communication.Reginald A. Fessenden became the first to send audio (wireless telephony) by means of electromagnetic waves in 1907.By 1910 these systems had come to be referred to by the common name radio.arconi's demonstrations of the use of radio for wireless communications, equipping ships with life saving wireless communications, establishing the first transatlantic radio service, and building the first stations for the British shortwave service, have marked his place in history.
The first purpose-built radio telescope was a 9-meter parabolic dish constructed by radio amateur Grote Reber in his back yard in Wheaton, Illinois in 1937. The sky survey he did with it is often considered the beginning of the field of radio astronomy.