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Condenser telephone
The condenser telephone, also known as the Phonopore telephone system, was an invention first patented in 1892 and subsequently introduced in many countries in large numbers, whereby telephone voice communications could be made over existing Morse code telegraph infrastructure at a low installation and running cost.
==Early communications==
In the 1830s the first commercial telegraph system was constructed in England. Over time the system was perfected and across the world overhead telegraph lines were built at rapid pace to connected towns and countries. The telegraph system allowed immediate communications by Morse telegraph codes to pass important government, commercial and private messages which up until then were delivered by mail on coaches and horseback.
The Telegraph system operated for many decades until voice communications were experimented with and perfected. Voice communications over telephone equipment was trialed in the 1860s and by the 1870s basic telephone apparatus were being used in small applications. In 1877 the first successful long distance telephone line was constructed in California, USA.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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