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Inventions of usa

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Inventions of usa

  1. 1. Inventions of USA
  2. 2. • Morse code is a method of transmitting textualinformation as a series of on-off tones, lights, or clicks that can be directly understood by a skilled listener or observer without special equipment. A related but different code was originally created for Samuel F. B. Morses electrictelegraph by Alfred Vail in the early 1840s.
  3. 3. • The phonograph was invented in 1877 by Thomas Alva Edison at his laboratory in Menlo Park, New Jersey, USA.[218][219][220][221] On February 8, 1878, Edison was issued the first patent (U.S. patent #200,521) for the phonograph.[222]
  4. 4. • The flexible flyer was invented in 1889 by Philadelphia resident Samuel Leeds Allen.[271]U.S. patent #408,681 was issued to Allen on August 13, 1889.[272]
  5. 5. • The earliest electric guitar, known as a "frying pan", was a hollow bodied acoustic instrument with tungsten steel pickups invented byGeorge Beauchamp and Adolph Rickenbacker in 1931. The electric guitar was a key instrument in the development of musical styles that emerged since the late 1940s, such as Chicago blues, earlyrock and roll, rockabilly, and 1960s blues rock. Electric guitars are used in almost every popular music genre
  6. 6. • Cooking food with microwaves was discovered by Percy Spencer on October 8, 1945, while building magnetrons for radar sets at Raytheon. Spencer was working on an active radar set when he noticed a strange sensation, and saw that a peanut candy bar he had in his pocket started to melt.

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