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| Keywords: Leibniz Stepped Reckoner mechanism.png Photo of the mechanism of the 'Stepped Reckoner' a prototype mechanical calculator invented by German mathematician Gottfried Wilhelm Leibniz in 1671 and completed in 1694 About 67 cm 26 in long This was the first calculator able to perform all the elementary operations addition subtraction multiplication and division The housing is removed to show the mechanism It consists of two parallel parts the 16 digit accumulator section to the rear and the 8 digit input section to the front The input section is mounted on rails and can be moved parallel to the accumulator with a crank and worm gear on the left end the crank is removed and lying in the foreground to align the digits of the operand with different digits of the accumulator The 16 vertical wheels on the front of accumulator section are the output dials with numbers 0-9 around their circumference that appear in windows in the top plate The 8 shiny horizontal disks on the input section in front are the operand dials with knobs for setting the operand into the machine The crank on the front performs the calculation For more information see http //www xnumber com/xnumber/ James Redin 2007 World of Calculators A Brief History of Calculators Part 1 The Age of the Polymaths Downloaded 2008-1-16 from http //books google com/books id xBkPAAAAIAAJ pg PA965 Wilhelm Franz Meyer 1904 Encyklopädie der Mathematischen Wissenschaften mit Einschluss ihrer Anwendungen Vol 2 Arithmetic und Algebra Druck und Verlag von E G Teubner Leipzig Germany p 964 fig 11 on Google Books 1904 Wilhelm Franz Meyer Public domain - Meyer died in 1934 PD-old Leibnitz calculator | ||||
