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An early American electrical plug and socket was invented by Harvey Hubbell and patented in 1904. Hubbell's first design was a socket which screwed into a lampholder (like the early lampholder plugs), but with a separable plug with pins ( U.S. patent 774,250 ) or blades (US patent 774251).
Hubbell received at least 45 patents, [3] most of which were for electric products. The pull-chain electrical light socket was patented in 1896, and his most famous invention, the U.S. electrical power plug, in 1904. It allowed the adoption in the U.S. of convenient, portable electrical devices, which Great Britain had enjoyed since the early ...
Hubbell's best-known inventions are the U.S. electrical plug [3] ... would become the first building in New England made of ... of America] S. Houston, TX 77587-3028 ...
From the first Apple computer to the COVID-19 vaccine, here are the most revolutionary inventions that were born in the U.S.A. in the past half-century.
Like in most European plugs, the power pins of Danish plugs are 19 mm (0.75 in) long and spaced 19 mm (0.75 in) apart, with a diameter of 4.8 mm (0.19 in). The earthing pin is part of the plug (in contrast to French and Schuko plugs); it is U-shaped, 14 mm (0.55 in) long, and offset from the power pins by 13 mm (0.51 in).
Voltages used for electric power transmission increased throughout the 20th century. [50] The first "high voltage" AC power station, rated 4-MW 10-kV 85-Hz, was put into service in 1889 by Sebastian Ziani de Ferranti at Deptford, London. [33] The first electric power transmission line in North America operated at 4000 V.
English scientist Edward Davy invented the electric relay. 1839: French scientist Edmond Becquerel discovered the photovoltaic effect. 1844: American inventor Samuel Morse developed telegraphy and the Morse code. 1844: Woolrich Generator, the earliest electrical generator used in an industrial process. [3] 1845
It was invented by American scientist Joseph Henry in 1831. [64] 1831 Doorbell (electric) A doorbell is a signaling device commonly found near a door. It commonly emits a ringing sound to alert the occupant of the building to a visitor's presence. The electric doorbell was invented by Joseph Henry in 1831. [25] [65] 1833 Sewing machine (lock ...