File:Leibniz Stepped Reckoner.png

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摘要

描述Leibniz Stepped Reckoner.png	Photo of the Staffelwalze (English: 'Stepped Reckoner'), a prototype mechanical calculator invented by German mathematician Gottfried Wilhelm Leibniz in 1674 and completed in 1694. About 67 cm (26 in.) long. This was the first calculator able to do all four arithmetic operations: addition, subtraction, multiplication, and division. Only two Stepped Reckoners were built. This one was found by workmen in 1879 in the attic of a building at the University of Gottingen, and is now in the National Library of Lower Saxony (Niedersächsische Landesbibliothek), Hannover, Germany. For more information see James Redin (2007) A Brief History of Calculators Part 1: The Age of the Polymaths. Caption: "Leibnitz calculator, made in 1694. The first two-motion machine designed to compute multiplication by repeated addition". Alterations: cropped out frame and caption, increased brightness.
日期	1921年
來源	Downloaded on 2008-1-14 from J. A. V. Turck (1921) Origin of Modern Calculating Machines, The Western Society of Engineers, Chicago, USA, p.133 on Google Books.
作者	J. A. V. Turck
許可 (重用呢個檔案)	Public domain - published in USA before 1923

Public domain	This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.	United States
	This image might not be in the public domain outside of the United States; this especially applies in the countries and areas that do not apply the rule of the shorter term for US works, such as Canada, Mainland China (not Hong Kong or Macao), Germany, Mexico, and Switzerland. The creator and year of publication are essential information and must be provided. See Wikipedia:Public domain and Wikipedia:Copyrights for more details.

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	日期／時間	縮圖	尺寸	用戶	註解
現時	2008年1月16號 (三) 12:48		1,235 × 803（213 KB）	Chetvorno	{{Information \|Description=Photo of the ''Staffelwalze'' (English: 'Stepped Reckoner') a prototype mechanical calculator invented by German mathematician Gottfried von Leibniz in 1674. Thi

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