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.
A transistor radio is a small portable radio receiver that uses transistor-based circuitry. Following their development in 1954, made possible by the invention of the transistor in 1947, they became the most popular electronic communication device in history, with billions manufactured during the 1960s and 1970s.