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model k calculator wikipedia jump to content main menu main menu move to sidebar hide navigation main page contents current events random article about wikipedia contact us contribute help learn to edit community portal recent changes upload file special pages search search appearance donate create account log in personal tools donate create account log in contents move to sidebar hide top 1 references toggle the table of contents model k calculator 1 language فارسی edit links article talk english read edit view history tools tools move to sidebar hide actions read edit view history general what links here related changes upload file permanent link page information cite this page get shortened url switch to legacy parser print export download as pdf printable version in other projects wikidata item appearance move to sidebar hide from wikipedia the free encyclopedia this article is about an early digital calculator for the automobile see ford model k the model k was an early 1 bit electromechanical binary adder built in november 1937 1 by bell labs scientist george stibitz as a proof of concept using scrap relays and metal strips from a tin can the k in model k came from k itchen table upon which he assembled it it would later become the basis for the technology of the model i calculator 2 3 4 5 stibitz created the model k after being asked to investigate the magnetic behaviour of relays realising the on off conditions behaved the same way as digits in binary 6 it included batteries two flashlight bulbs as output 6 and two switches made from metal from a tobacco can 1 7 the reaction to the model in bell labs was amusement 7 8 a replica of the model k created in 1980 references edit 1 2 petzold charles august 2 2022 code the hidden language of computer hardware and software microsoft press isbn 978 0 13 790929 2 stibitz model k adder 102627225 computer history museum www computerhistory org retrieved august 31 2018 george robert stibitz s complex number calculator archived from the original on july 4 2008 retrieved september 29 2017 model k adder replica chm revolution www computerhistory org retrieved august 31 2018 irvine m m july 2001 early digital computers at bell telephone laboratories pdf ieee annals of the history of computing 23 3 22 42 doi 10 1109 85 948904 issn 1058 6180 1 2 danton tim july 29 2025 the computers that made the world raspberry pi press isbn 978 1 916868 08 3 1 2 holmes james d j 1972 perspectives on electronic data processing a book of readings internet archive englewood cliffs n j prentice hall isbn 978 0 13 661009 0 the relay computers at bell labs pdf archived from the original pdf on december 26 2014 this technology related article is a stub you can help wikipedia by adding missing information v t e retrieved from https en wikipedia org w index php title model_k_ calculator oldid 1364575334 categories american inventions calculators digital electronics technology stubs hidden categories use mdy dates from october 2021 all stub articles this page was last edited on 17 july 2026 at 08 37 utc page was rendered with parsoid text is available under the creative commons attribution sharealike 4 0 license additional terms may apply by using this site you agree to the terms of use and privacy policy wikipedia is a registered trademark of the wikimedia foundation inc a non profit organization privacy policy about wikipedia disclaimers contact wikipedia legal safety contacts code of conduct developers statistics cookie statement mobile view search search toggle the table of contents model k calculator 1 language add topic