Computer science: Difference between revisions

[[Wilhelm Schickard]] designed and constructed the first working [[mechanical calculator]] in 1623.<ref>{{cite web|title=Wilhelm Schickard – Ein Computerpionier|url=http://www.fmi.uni-jena.de/fmimedia/Fakultaet/Institute+und+Abteilungen/Abteilung+f%C3%BCr+Didaktik/GDI/Wilhelm+Schickard.pdf|language = de}}</ref> In 1673, [[Gottfried Leibniz]] demonstrated a digital mechanical calculator, called the [[Stepped Reckoner]].<ref>{{cite web|title=A Brief History of Computing|url=http://blogs.royalsociety.org/history-of-science/2012/06/25/history-of-computing/|first = Fiona|last = Keates|work = The Repository|publisher = The Royal Society|date = 25 June 2012}}</ref> Leibniz may be considered the first computer scientist and information theorist, for, among other reasons, documenting the binary number system. In 1820, [[Charles Xavier Thomas|Thomas de Colmar]] launched the [[mechanical calculator]] industry<ref group=note>In 1851</ref> when he invented his simplified [[arithmometer]], the first calculating machine strong enough and reliable enough to be used daily in an office environment. [[Charles Babbage]] started the design of the first ''automatic mechanical calculator'', his [[Difference Engine]], in 1822, which eventually gave him the idea of the first ''programmable mechanical calculator'', his [[Analytical Engine]].<ref>{{cite web|title=Science Museum, Babbage's Analytical Engine, 1834-1871 (Trial model)|url=https://collection.sciencemuseumgroup.org.uk/objects/co62245/babbages-analytical-engine-1834-1871-trial-model-analytical-engines|access-date=2020-05-11}}</ref> He started developing this machine in 1834, and "in less than two years, he had sketched out many of the [[wikt:Special:Search/salient|salient]] features of the modern computer".<ref name="Hyman1982">{{cite book |author=Anthony Hyman |title=Charles Babbage, pioneer of the computer |url=https://archive.org/details/charlesbabbagepi0000hyma |url-access=registration |year=1982}}</ref> "A crucial step was the adoption of a punched card system derived from the [[Jacquard loom]]"<ref name="Hyman1982" /> making it infinitely programmable.<ref group=note>"The introduction of punched cards into the new engine was important not only as a more convenient form of control than the drums, or because programs could now be of unlimited extent, and could be stored and repeated without the danger of introducing errors in setting the machine by hand; it was important also because it served to crystallize Babbage's feeling that he had invented something really new, something much more than a sophisticated calculating machine." [[#COLLIER|Bruce Collier]], 1970</ref> In 1843, during the translation of a French article on the Analytical Engine, [[Ada Lovelace]] wrote, in one of the many notes she included, an algorithm to compute the [[Bernoulli number]]s, which is considered to be the first published algorithm ever specifically tailored for implementation on a computer.<ref>{{cite web|url=http://www.scottlan.edu/Lriddle/women/ada-love.htm |title=A Selection and Adaptation From Ada's Notes found in Ada, The Enchantress of Numbers," by Betty Alexandra Toole Ed.D. Strawberry Press, Mill Valley, CA |access-date=4 May 2006 |url-status=dead |archive-url=https://web.archive.org/web/20060210172109/http://www.scottlan.edu/lriddle/women/ada-love.htm |archive-date=February 10, 2006 }}</ref> Around 1885, [[Herman Hollerith]] invented the [[tabulating machine|tabulator]], which used [[punched card]]s to process statistical information; eventually his company became part of [[IBM]]. Following Babbage, although unaware of his earlier work, [[Percy Ludgate]] in 1909 published <ref>{{Cite web |url=https://scss.tcd.ie/SCSSTreasuresCatalog/miscellany/TCD-SCSS-X.20121208.002/TCD-SCSS-X.20121208.002.pdf/ |title=The John Gabriel Byrne Computer Science Collection |access-date=August 8, 2019 |archive-url=https://web.archive.org/web/20190416071721/https://www.scss.tcd.ie/SCSSTreasuresCatalog/miscellany/TCD-SCSS-X.20121208.002/TCD-SCSS-X.20121208.002.pdf |archive-date=April 16, 2019 |url-status=dead }}</ref> the 2nd of the only two designs for mechanical analytical engines in history. In 1937, one hundred years after Babbage's impossible dream, [[Howard H. Aiken|Howard Aiken]] convinced IBM, which was making all kinds of punched card equipment and was also in the calculator business<ref>"In this sense Aiken needed IBM, whose technology included the use of punched cards, the accumulation of numerical data, and the transfer of numerical data from one register to another", [[#AIKEN|Bernard Cohen]], p.44 (2000)</ref> to develop his giant programmable calculator, the [[Harvard Mark I|ASCC/Harvard Mark I]], based on Babbage's Analytical Engine, which itself used cards and a central computing unit. When the machine was finished, some hailed it as "Babbage's dream come true".<ref>[[#ORIGINS|Brian Randell]], p. 187, 1975</ref>