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The telephone instrument obtained talking current by powering a carbon microphone with a local battery, consisting of "N° 6" zinc–carbon dry cells. By around 1900, large racks of motor-generator sets in the telephone exchange could supply this ringing current remotely instead and the local magneto was often no longer required, [2] but their ...
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Telegraphy is the long-distance transmission of messages where the sender uses symbolic codes, known to the recipient, rather than a physical exchange of an object bearing the message. Thus flag semaphore is a method of telegraphy, whereas pigeon post is not. Ancient signalling systems, although sometimes quite extensive and sophisticated as in ...
A battery starts a small diesel generator installed in a hydroelectric generating station. The power from the diesel generator is used to bring the generating station into operation. Key transmission lines between the station and other areas are energized. The power from the station is used to start one of the nuclear/fossil-fuel-fired base ...
Pulsar 12,000W Dual Fuel Portable Generator - $879.99 (26% off) $899.99 at Walmart. Key Features. Powered by a “457cc, single cylinder, 4-stroke, air cooled, OHV engine protected by a durable ...
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Telephone and Data Systems, (through its subsidiary TDS) serves mainly rural areas in parts of 36 states. Cincinnati Bell, which serves the greater Cincinnati area, and Hawaii due to its acquisition of Hawaiian Telcom was not included in the Bell System breakup of 1984 because the former AT&T held only a minority stake in that company.
Kenmore 9392 is a five-pull (1L-4N) small-city telephone number for the Kenmore exchange in Fort Wayne, Indiana. MArket 7032 is a six-digit (2L-4N) telephone number. This format was in use from the 1920s through the 1950s, and was phased out c. 1960. BALdwin 6828 is an urban 3L-4N example, used only in the largest cities before conversion to ...