When was television introduced to the general public?
By the 1920s, when amplification made television practical, Scottish inventor John Logie Baird employed the Nipkow disk in his prototype video systems. He created his prototype in a little village called Santa Cruz on the island of Trinidad where he was recovering from an illness. He also started work on the first color television. On March 25, 1925, Baird gave the first public demonstration of televised silhouette images in motion, at Selfridge's Department Store in London. Since human faces had inadequate contrast to show up on his primitive system, he televised a talking, moving ventriloquist's dummy named "Stooky Bill", whose painted face had higher contrast. By January 26, 1926, he had demonstrated the transmission of an image of a face in motion by radio. This is widely regarded as the first television demonstration in history. The subject was Baird's business partner Oliver Hutchinson. Baird's system used the Nipkow disk for both scanning the image and displaying it. A bright light shining through a spinning Nipkow disk set with lenses projected a bright spot of light that swept across the subject. A selenium photoelectric tube detected the light reflected from the subject and converted it into a proportional electrical signal. This was transmitted by AM radio waves to a receiver unit, where the video signal was applied to a neon light behind a second Nipkow disk rotating synchronized with the first. The brightness of the neon lamp was varied in proportion to the brightness of each spot on the image. As each hole in the disk passed by, one scan line of the image was reproduced. Baird's disk had 30 holes, producing an image with only 30 scan lines, just enough to recognize a human face.
When was televised silhouette images in motion introduced to the general public?
March 25, 1925
History of television
An American inventor, Charles Francis Jenkins, also pioneered the television. He published an article on "Motion Pictures by Wireless" in 1913, but it was not until December 1923 that he transmitted moving silhouette images for witnesses. On June 13, 1925, Jenkins publicly demonstrated the synchronized transmission of silhouette pictures. In 1925, Jenkins used a Nipkow disk and transmitted the silhouette image of a toy windmill in motion, over a distance of five miles (from a naval radio station in Maryland to his laboratory in Washington, D.C.), using a lensed disk scanner with a 48-line resolution. He was granted U.S. patent 1,544,156 (Transmitting Pictures over Wireless) on June 30, 1925 (filed March 13, 1922).
When was synchronized transmission of silhouette pictures introduced to the general public?
June 13, 1925
History of television
At the Berlin Radio Show in August 1931, Manfred von Ardenne gave a public demonstration of a television system using a CRT for both transmission and reception. However, Ardenne had not developed a camera tube, using the CRT instead as a flying-spot scanner to scan slides and film. Philo Farnsworth gave the world's first public demonstration of an all-electronic television system, using a live camera, at the Franklin Institute of Philadelphia on August 25, 1934, and for ten days afterwards.
When was CRT television introduced to the general public?
August 1931
History of television
No context provided
When was all-electric television introduced to the general public?
August 25, 1934
History of television
https://en.wikipedia.org/wiki/History%20of%20television
John Logie Baird FRSE (/ˈloʊɡi bɛərd/;[1] 13 August 1888 – 14 June 1946) was a Scottish inventor, electrical engineer, and innovator who demonstrated his working television system on 26 January 1926.
John Logie Baird
A cathode-ray tube (CRT) is a vacuum tube containing one or more electron guns, the beams of which are manipulated to display images on a phosphorescent screen.
Cathode-ray tube
Philo Farnsworth gave the world's first public demonstration of an all-electronic television system, using a live camera, at the Franklin Institute of Philadelphia on August 25, 1934, and for ten days afterwards.
History of television
On March 25, 1925, Scottish inventor and innovator John Baird gave the first public demonstration of televised silhouette images in motion. A few months later, on June 13, 1925, American inventor Charles Francis Jenkins publicly demonstrated the synchronized transmission of silhouette pictures. As television technology advanced, more innovations were added to the television system. As such, Manfred von Ardenne gave a public demonstration in August 1931 of a television system using a cathode-ray tube (CRT) for both transmission and reception. On August 25, 1934, Philo Farnsworth gave the world's first public demonstration of an all-electronic television system, using a live camera. This would also coincide with the date when all-electric television were introduced to the general public.