Telecommunication Early means of communicating over a distance included visual signals, such as beacons, smoke signals, semaphore telegraphs, signal flags, and optical heliographs. Other examples of pre-modern long-distance communication included audio messages such as coded drumbeats, lung-blown horns, and loud whistles. 20th- and 21st-century technologies for long-distance communication usually involve electrical and electromagnetic technologies, such as telegraph, telephone, and teleprinter, networks, radio, microwave transmission, fiber optics, and communications satellites. A revolution in wireless communication began in the first decade of the 20th century with the pioneering developments in radio communications by Guglielmo Marconi, who won the Nobel Prize in Physics in
The Loneliness of the Long Distance Walker sabotage his medical test fail, Walker is invalided out because he's allergic to corned beef. The radio episode still exists and was released on Series 1 DVD, along with the other 2 missing episodes. The Loneliness of the Long Distance Walker The Loneliness of the Long Distance Walker is a missing episode in the British comedy series "Dad's Army". It was originally transmitted on Saturday 15 March 1969. Although screenshots and clips of the episode exist, the full episode is still missing from BBC Archives. To his complete surprise, Walker receives his call-up papers. Mainwaring tries his best to get