| In this next part in our series on the
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| | a patent in 1891 for his first automatic
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| history of the telephone, we're going to
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| | telephone exchange.The very first
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| pick up with the construction of the
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| | exchange that used the Strowger Switch
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| first regular telephone line.After Bell's
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| | was set up in La Porte, Indiana in 1892.
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| completion of the telephone in 1876 the
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| | At first, subscribers to the service had
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| next step was making it so that this
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| | a button on their telephone that produced
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| invention could be used by everybody. So
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| | the required number of pulses by tapping
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| in 1877, construction of the first
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| | on it. It wasn't until 1896 that one of
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| regular telephone line, which ran from
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| | Strowger's assistants invented the rotary
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| Boston to Somerville, Massachusetts, was
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| | dial. This ultimately replaced the
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| finished. By the end of 1880 there were
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| | button and is still in use on telephones
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| over 47,900 telephones in the United
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| | today, mostly for novelty purposes. In
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| States and in 1881 a telephone service
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| | 1943, Philadelphia was the last city to
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| from Boston to Providence was set up.
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| | give up dual service for both button and
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| Then in 1892, they started a service
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| | pulse dialling.The first touch tone
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| between New York and Chicago. Two years
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| | system, which used tones in the voice
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| later, in 1894, a service began between
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| | frequency range instead of pulses used by
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| New York and Boston but it wasn't until
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| | rotary dials, was installed in Baltimore,
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| 1915 that transcontinental service by
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| | Maryland in 1941. Operators in a central
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| overhead wire was created. Backtracking
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| | switching office pushed the buttons to
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| a bit, the first switchboard, what we now
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| | make this work. The problem was, it was
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| call 411 service, was set up in Boston in
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| | just too expensive for general use by the
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| 1877. Then on January 17, 1882, Leroy
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| | public, but the Bell Telephone Company,
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| Firman got his first patent for a
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| | named after the man credited with the
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| telephone switchboard.The first telephone
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| | invention of the phone, was still
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| exchange was set up in New Haven in 1878.
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| | interested in the touch tone system
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| The first telephones were leased to
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| | because it increased the speed of
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| people in pairs. Each person was
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| | dialling.The answer to this problem came
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| required to put up his own line in order
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| | in the 1960s when low cost transistors
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| to connect with another. Finally, in
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| | and circuit components made the cost
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| 1889, a Kansas City undertaker by the
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| | effective use of touch tone telephones in
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| name of Almon B. Strowger invented a
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| | a person's home a real possibility.
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| switch that could connect one line to any
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| | Through much testing, positioning of the
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| one of 100 lines using a series of relays
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| | buttons limited errors and increased
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| and sliders. This switch came to be
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| | dialling speed even more. The touch tone
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| known as the Strowger Switch and it was
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| | phone got its big preview at the 1962
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| still being used by telephone offices
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| | Seattle World's Fair, where it was a huge
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| over 100 years later. Strowger was given
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| | success.
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