A few weeks ago, I mentioned how much I love watching Antiques Roadshow. In the episode I saw this week, a man brought an 1880s era stock ticker to be appraised and it really piqued my interest. So I decided to do some research and found: Edward A. Calahan invented the stock ticker in 1867 to convey stock prices over a long distance. A special typewriter was used to send the stock quotes over telegraph wire that then displayed them on the stock ticker at the other end of the connection. A bit different from the way we can...