Telegraph, telephone, Radio and television by

Electromagnet -1825

MaximusHartmann — 2023-11-13 11:20:00 UTC

-> Invented by William Sturgeon (1783-1878)
-> revolutinary new electronic communication device

Telegraph System

MaximusHartmann — 2023-11-13 11:31:04 UTC

-> Joseph Henry (1797-1878) demonstrated the power of the electromagnet by sending a mile long signal to ring a bell
-> Samuel Morse (1791-1872) developed the invention so far that it was a practical and commercial success

Samuel Morse

MaximusHartmann — 2023-11-13 11:44:22 UTC

-> Teacher in arts and design in New York at a university in 1835
-> proved that transmitted electromagnetic signals into a written code
-> first type of morse coding

Telephone rivals Telegraph

MaximusHartmann — 2023-11-16 09:04:09 UTC

-> until 1877 all long distance communication were done by the telegraph
-> but in 1879 a really good rival came up, the telephone

Alexander Graham Bell

2023-11-16 09:05:52 UTC

-> Born on March 3, 1847 in Scotland, Edinburgh
-> Immigrate to Canada 1870, then to Boston (USA)
-> Established speech-therapy practices for deaf children
-> Bell continues to study his own interests of the study of sounds
-> Tried to improve the Telegraph

The Telephone

2023-11-16 09:13:10 UTC

-> Wire-based System
-> Explored the Telephone system, when he was experimenting with electric signals
-> Was limited to receiving and sending one message at a time
-> In June 1875 it was possible to transmit speech electronically. After this the first telephone call was possible

Telephone Network

2023-11-16 09:17:13 UTC

-> In 1880 were over 49.000 used in the US
-> In 1876 Bell founded the forerunner company of todays AT&T, which is until today one of the biggest American leading company’s

the idea of Television

MaximusHartmann — 2023-11-23 07:52:04 UTC

-> way earlier than the tv was really invented, inventors thought about visualizing electromagnetic signals
-> it began in the late 1800s
-> Brauns cathode ray tube played a major role when it comes to the invention of the television

Invention

mattisschwering — 2023-11-23 07:59:11 UTC

- 1904 Guglielmo Marconi partented the first official radio

- He began in italy but didn't get the support he needed so he went to england

- His ideas came from Hienrich Hertz

- In the beginning it was used as a person-to-person communication for naval ships to communicate with other ships and with land stations

Mechanical Television 1930s

MaximusHartmann — 2023-11-23 08:04:35 UTC

-> the programm was transmitted with cables to a screen
-> problem: had some limits by using it, which caused only 240 lines of resolution (distorded pictures)
-> during this the teenager Farnsworth found out that electronic beams could scan pictures in horizontal lines
-> slowly the electronical takes over the mechanical television, because of the better pictures, no noise, a smaller size and the less limitiations
-> by 1939 the mechanical television was completely replaced trough the electrical tv

Television only for the upper classes

MaximusHartmann — 2023-11-23 08:10:39 UTC

-> before world war ll the tv´s were really expensive that only the richer people could afford it
-> due to world war ll many of the televisions werent selled
->

The Innovation

mattisschwering — 2023-11-23 08:13:10 UTC

- 1909, in the United States a service allowed subscribers to listen to specific music on telephone

- 1919, small stations began to include religious sermons, sports, music and news on radion

- A few years later, advertising was accepted on Radio, wich was fist ran only during day but later also as a normal part of the radio soundscape

- Later the radio was quiet only used for music because of the invention of the television

Color tv

MaximusHartmann — 2023-11-23 08:17:14 UTC

-> was already produced in 1904 but werent availible until the 1960s
-> int the 1950s the tvs got a massive increase of popularity (already 6 million pieces)
-> at first they did not see the possibilitys of it, but only 3 years later the first films were produced

Golden Age of Radio

mattisschwering — 2023-11-23 08:22:21 UTC

- Between 1930 and the mid-1950s

- Because of the struggles of the Great Depression

- People planed their live after the radio

- 1937, when the Hindenburg blimp exploded, it was recorded from radio and the entire event was later broadcast including the sound of the explotion

digital television overtakes electric television

MaximusHartmann — 2023-11-23 08:29:43 UTC

-> after 60 years mostly the japenese were developing the digital version, that didnt flicker amd had a way better resolution
-> this new HDTV created almost a threedimensional experience for people who are watching tv
-> the first were available in 1998 but they were very expensive 5,000€-10,000€