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A telephone magneto is a hand-cranked electrical generator that uses permanent magnets to produce alternating current from a rotating armature. In early telegraphy , magnetos were used to power instruments, while in telephony they were used to generate electrical current to drive electromechanical ringers in telephone sets and activate signals ...
Swedish telephone (ca. 1896) with the hand crank of the magneto on the right side Manual telephones for local battery station service in magneto exchanges were equipped with a hand-cranked magneto generator to produce an alternating voltage to alert the central office operator, or to ring the bells of other telephones on the same (party) line .
In present Freeplay radios and other products, clockwork mechanisms storing energy in a mainspring have now been replaced by small batteries charged by cheaper hand-crank generators. [9] Freeplay Energy produces a variety of consumer devices in addition to radios, including flashlights, lanterns, mobile phone chargers, and foot-powered generators.
According to F. Lisheng and T. Qingjun, the hand-crank of the rotary quern was different from a crank, which was the combination of a hand-crank and a push-and-pull connecting rod by a hinge. [7] The Antikythera mechanism, dated to around 200 BC, [25] [26] used a crank as a part of its mechanism. [27]
PHOTO: Olivier Rioux, 7-foot-9 NCAA college basketball player at Forida, poses after practice, Oct. 18, 2024 in Gainesville, Fla. (John Raoux/AP)
U.S. soldiers using a GN-45 hand crank generator to power their radio set during World War II During World War II , U.S. troops sometimes employed hand crank generators, GN-35 and GN-45, to power Signal Corps Radio transmitter/receivers . [ 10 ]
A Nashville, Tennessee, couple shocked their family members with their pregnancy reveal and a video of the relatives' reactions has quickly gone viral. Olivia Walker's TikTok post has picked up ...
The 'Old Farmer's Almanac' Christmas weather predictions are here, and it looks like it will be a mild holiday. Here's what to expect on December 25 in 2024.
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