111:, he encountered a group of rushing messenger boys which inspired him to improve exchange communications. These young men called runners had to dash from the Stock Exchange to their offices to report the changes in share values. Calahan realized that the prices could be sent directly via telegraph to each broker's office much more quickly and efficiently in a permanent stream of information. With the idea, he invented the
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Connected earth:Calahan, Edward
Augustin;In 1867 Edward Calahan invented the first machine to print out the price of stocks and shares over telegraph wires.
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New York Times:E.A. CALAHAN, INVENTOR, DIES; Originator of Gold and Stock Ticker and
Multiplex Telegraph System.September 13, 1912
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in 1867. After many years of work he started the company ADT security, which still stands today. He was inducted to the
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154:"Hall of fame;inventor profile;Edward Augustin Calahan;Improvement in Telegraphic Indicators;Patent No. 76,157"
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Invention of ticker tape, gold and stock tickers, multiplex telegraph system
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77:(1838–1912) was an American inventor, credited with invention of a
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189:Patent number: 76157;Issue date: Mar 31, 1868
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81:, gold and stock tickers, and a multiplex
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99:in 1861 and made his residence in
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217:19th-century American inventors
117:National Inventors Hall of Fame
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119:in 2006 for this invention.
44:1912 (aged 73–74)
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75:Edward Augustin Calahan
107:. While working with
90:Boston, Massachusetts
35:Boston, Massachusetts
88:Calahan was born in
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23:Edward A. Calahan
16:American inventor
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162:. Retrieved
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212:1912 deaths
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113:ticker tape
79:ticker tape
49:Nationality
201:Categories
164:2012-02-24
123:References
57:Occupation
105:Manhattan
83:telegraph
101:Brooklyn
97:New York
85:system.
60:Inventor
52:American
41:Died
32:1838
29:Born
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