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Christopher Latham Sholes (February 14, 1819 – February 17, 1890) was an American inventor who invented the QWERTY keyboard, [2] and, along with Samuel W. Soule, Carlos Glidden and John Pratt, has been contended to be one of the inventors of the first typewriter in the United States. [3] [4] [5] He was also a newspaper publisher and Wisconsin ...
In 1857 Sargent had designed the "Sargent's Magnetic Bank Lock", said to be the first successful key changeable combination lock. In 1880 Sargent connected one of his combination locks to a delay timer, creating the first time-delay combination locks.
Because these keys receive less wear, they are often made of black colored wood and called the black notes or black keys. Black keys form a pentatonic scale. The entire pattern repeats at the interval of an octave. The arrangement of longer keys for C major with intervening, shorter keys for the intermediate semitones date to the 15th century.
In 1915 he invented the first vacuum tube instrument, the audio piano. Until the invention of the transistor , the vacuum tube was an essential component in electric instruments. In 1935, the Hammond organ was introduced, [ 7 ] exploiting previous limited production efforts like the Robb Wave Organ [ 8 ] from 1923.
1911: The cloud chamber, the first particle detector, is invented by Charles Thomson Rees Wilson. 1912: The first commercial slot cars or more accurately model electric racing cars operating under constant power were made by Lionel (USA) and appeared in their catalogues in 1912. 1912: The first use of articulated trams by Boston Elevated Railway.
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The key switches are connected via the printed circuit board in an electrical X-Y matrix where a voltage is provided sequentially to the Y lines and, when a key is depressed, detected sequentially by scanning the X lines. The first computer keyboards were for mainframe computer data terminals and used discrete electronic parts.
In the time warp that COVID-19 created in most of our lives, it's hard to believe it's been five years since any of us first heard of a mysterious illness making people sick in China. But it was ...