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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.
Reis's telephone around 1861, first device called telephone [16] Bell's first telephone transmitter, ca. 1876, reenacted 50 years later Acoustic telephone ad, The Consolidated Telephone Co., Jersey City, New Jersey, 1886 1896 telephone from Sweden Wooden wall telephone with a hand-cranked magneto generator
The subscriber set interfaced a telephone set to the telephone network, while magneto generators were used in a manual exchange to generate a remote ring signal. The Western Electric 302-type telephone was the first widely used Bell System telephone to include the ringer and other subscriber set components inside the housing of the telephone set.
The term originated in magneto telephone signaling in which cranking the magneto generator, either integrated into the telephone set or housed in a connected ringer box, would not only ring its bell but also cause a drop to fall down at the telephone exchange switchboard, marked with the number of the line to which the magneto telephone ...
The first field telephones had a battery to power the voice transmission, a hand-cranked generator to signal another field telephone or a manually-operated telephone exchange, and an electromagnetic ringer which sounded when current from a remote generator arrived. This technology was used from the 1910s to the 1980s.
The woman accused of stabbing a postal worker to death over a spot in line at a Harlem deli has a long history of knife violence — and once threatened “to cut” one of her previous victims.
The Tucker Telephone is a torture device designed using parts from a crank telephone. The electric generator of the telephone is wired in sequence to two dry cell batteries so that the instrument can be used to administer electric shocks to another person. The Tucker Telephone was invented by A. E. Rollins, [1] the resident physician at the ...