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printing telegraph
The printing telegraph was invented by Royal Earl House in 1846. House's equipment could transmit around 40 instantly readable words per minute, but was difficult to manufacture in bulk. The printer could copy and print out up to 2,000 words per hour. This invention was first put in operation and exhibited at the Mechanics Institute in New York in 1844.〔http://invention.smithsonian.org/resources/MIND_Repository_Details.aspx?rep_id=496〕〔http://www.telegraph-history.org/george-m-phelps/house.htm〕
House’s Type Printing Telegraph of 1849 was Royal Earl House's second and much improved type-printing instrument and was widely used on lines on America's east coast from 1850.〔(【引用サイトリンク】title=ILLUSTRATIONS OF TELEGRAPH INSTRUMENTS. )〕 Hughes telegraph devices, which also had piano style keyboards, were very popular in France, where there were likely many more piano and harpsichord players than telegraphers.
Early stock ticker machines are also examples of printing telegraphs.
==Operation==
The device was made by linking two 28-key piano-style keyboards by wire. Each piano key represented a letter of the alphabet and when pressed caused the corresponding letter to print at the receiving end. A "shift" key gave each main key two optional values. A 56-character typewheel at the sending end was synchronised to coincide with a similar wheel at the receiving end. If the key corresponding to a particular character was pressed at the home station, it actuated the typewheel at the distant station just as the same character moved into the printing position, in a way similar to the daisy wheel printer. It was thus an example of a synchronous data transmission system.
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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