James Jacob Ritty (29 October 1836 – 29 March 1918), saloonkeeper and inventor, opened his first saloon in Dayton, Ohio in 1871, billing himself as a "Dealer in Pure Whiskies, Fine Wines, and Cigars." Some of Ritty's employees would take the customers' money and pocket it, rather than depositing the cash that was meant to pay for the food, drink, and other wares. In 1878 while on a steamboat trip to Europe, Ritty became intrigued by a mechanism that counted how many times the ship's propeller went around. He wondered if something like this could be made to record the cash transactions made at his saloon.

• http://en.wikipedia.org/wiki/James Ritty
• John Ritty on www.findagrave.com