[GreenKeys] First stock ticker debuts 1867

[Dave Horsfall]

http://www.history.com/this-day-in-history/first-stock-ticker-debuts

``On this day in 1867, the first stock ticker is unveiled in New York
   City. The advent of the ticker ultimately revolutionized the stock market
   by making up-to-the-minute prices available to investors around the
   country. Prior to this development, information from the New York Stock
   Exchange, which has been around since 1792, traveled by mail or messenger.

   The ticker was the brainchild of Edward Calahan, who configured a
   telegraph machine to print stock quotes on streams of paper tape (the same
   paper tape later used in ticker-tape parades). The ticker, which caught on
   quickly with investors, got its name from the sound its type wheel made.''

-- Dave