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A partially disassembled Curta calculator, showing the digit slides and the stepped drum behind them Curta Type I calculator, top view Curta Type I calculator, bottom view. The Curta is a hand-held mechanical calculator designed by Curt Herzstark. [1] It is known for its extremely compact design: a small cylinder that fits in the palm of the hand.
The Ready-Reckoner, or Farmer’s Complete Table; Aberystwyth, 19th century. A ready reckoner is a printed book or table containing pre-calculated values, often multiples of given amounts. They were widely used in shops and by tradesmen before the advent of cheap electronic calculators, metric weights and measures and decimal currencies in the ...
In Betting Thoroughbreds, Steve Davidowitz claimed that (in 1974), "the top-figure horse wins 35 percent of the time, at a slight loss for every $2.00 wagered." This is an example of using the top figure as a "power rating," or singular measure of a horse's ability. In horse racing, power ratings are generally called class ratings.
The stepped reckoner or Leibniz calculator was a mechanical calculator invented by the German mathematician Gottfried Wilhelm Leibniz (started in 1673, when he presented a wooden model to the Royal Society of London [2] and completed in 1694). [1]
In the position shown, the counting wheel meshes with three of the nine teeth of the Leibniz wheel. A Leibniz wheel or stepped drum is a cylinder with a set of teeth of incremental lengths which, when coupled to a counting wheel, can be used in the calculating engine of a class of mechanical calculators.
Behind the betting windows at Ascot racetrack, Australia February 1939. An automatic totalisator is a device to add up the bets in a pari-mutuel betting system. The whole of the pot (the stakes on all competitors) is divided pro rata to the stakes placed on the winning competitor, and those tickets are paid out.
Easy Goer (March 21, 1986 – May 12, 1994) was an American Champion Hall of Fame Thoroughbred racehorse known for earning American Champion Two-Year-Old Colt honors in 1988, and defeating 1989 American Horse of the Year Sunday Silence in the Belmont Stakes by eight lengths.
A race book showing race conditions and starters in a Melbourne Cup.. A racecard is a printed card used in horse racing giving information about races, principally the horses running in each particular race.