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| Â | A Java3D-Visualisation of the Schickard Calculator |
 | | The Schickard Calculator is the first known mechanical calculator to add, subtract, multiply and divide. | | | On this page you will find everything you need to start the applet and much more... | | | Java 3D-Simulation of the Schickard Calculator from 1623 |
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http://www.gris.uni-tuebingen.de/projects/schickard/
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| Â | A Chronology of Digital Computing Machines (to 1952) |
| | This 5-digit machine uses a different carry mechanism from Schickard's, with rising and falling weights instead of a direct gear drive; it can be extended better to support more digits, but it cannot subtract, and probably is less reliable than Schickard's simpler method. | | | Where Schickard's machine is forgotten -- and indeed Pascal is apparently unaware it ever existed -- Pascal's becomes well known and establishes the computing machine concept in the intellectual community. | | | This is a 6-digit machine that can add and subtract, and indicates overflow by ringing a bell. |
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http://www.davros.org/misc/chronology.html
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| Â | Wilhelm Schickard |
| | In 1623, Schickard built a mechanical device which could perform mathematical operations. | | | What you have done by calculation I have just tried to do by way of mechanics. | | | However, in the 1950s, scholars who were collecting the works of Kepler found, tucked into a book, Schickard's original drawings of his device. |
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http://www.cs.cuw.edu/museum/Schickard.html
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| Â | Université de Tübingen, WSI/GRIS |
| | INSTITUTION = {Wilhelm Schickard Institute for Computer Science, Graphical-Interactive Systems (WSI/GRIS), University of Tübingen}, |
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http://www.gris.uni-tuebingen.de/publics/staff/Wolfgang_Strasser_tex_fr.html
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| Â | History of Computers [encyclopedia] |
| | Among the first calculating machines were the 1624 'calculating clock' of Wilhelm Schickard (1592-1635), which could perform addition and subtraction, PASCAL'S calculator of 1642 and that of LEIBNIZ in the 1670s. | | | Although Leibniz's invention used a stepped gear principle which became common in future designs, all of these were essentially curiosities rather than practical machines. |
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http://kosmoi.com/Computer/History/
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| Â | Wilhelm Schickard |
| | He wrote to Kepler suggesting a mechanical means to calculate ephemerides. | | | Long before Pascal and Leibniz, Schickard invented a calculating machine in 1623 which was used by Kepler. | | | Wilhelm Schickard was educated at the University of Tübingen. |
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http://www.thocp.net/biographies/schickard_wilhelm.html
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| Â | Wilhelm Schickard |
| | The first design of a programmable computer came roughly 200 years later ( Charles Babbage). | | | Wilhelm Schickard (born 1592 in Herrenberg - died 1635 in Tübingen) built the first automatic calculator in 1623. | | | Schickard's letters to Johannes Kepler show how to use the machine for calculating astronomical tables. |
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http://www.freeglossary.com/Wilhelm_Schickard
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| Â | Wilhelm Schickard's Mechanical Calculator |
| | These notes are abstracted from the book Bebop BYTES Back | | | Unfortunately, no original copies of Schickard's machine exist, but working models have been constructed from his notes. | | | Schickard wrote that he had built a machine that "... |
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http://www.maxmon.com/1625ad.htm
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