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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.
Western Electric Co., Inc. was an American electrical engineering and manufacturing company that operated from 1869 to 1996. A subsidiary of the AT&T Corporation for most of its lifespan, Western Electric was the primary manufacturer, supplier, and purchasing agent for all telephone equipment for the Bell System from 1881 until 1984, when the Bell System was dismantled.
1917 wall telephone, open to show magneto and local battery. Early telephones were technically diverse. Some of them used liquid transmitters which soon went out of use. Others were dynamic: their diaphragms vibrated a coil of wire in the field of a permanent magnet or vice versa.
The most common variety, was the B1A hand telephone set, which was used for local battery telephones with a wooden subscriber set and magneto box, and for common battery lines with a steel-enclosure subscriber set (No. 534A). In 1930, the designation was superseded by 102 type hand telephone set.
Telephone Systems Telephone sets and terminals LAN and MAN equipment Application Server 5200 and Application Server 5300 (AS5300) Nortel business phones, digital sets for Meridian and Norstar Baystack and ERS (Ethernet Routing Switch), managed network switches for Ethernet; ERS-8600, ERS-8300, ERS-5600, ERS-5500, ERS-4500, ERS-2500
The ideal back for the woman on-the-go, this crossbody bag is designed to hold just your essentials: phone, keys, wallet, and perhaps a lipstick or two. Choose from 27 different colors and ...
Amos Dolbear was born in Norwich, Connecticut, on November 10, 1837. [3] He was a graduate of Ohio Wesleyan University, in Delaware, Ohio.While a student there, he had made a "talking telegraph" and invented a receiver containing two features of the modern telephone: a permanent magnet and a metallic diaphragm that he made from a tintype.