Englishman Robert Bissaker invented the slide ruler in 1654. The ruler was useful for arithmetical calculations by means of logarithmically graduated scales that used a fixed stock.
- Slide Rule invented by William Oughtred – Computing History
After John Napier invented logarithms, and Edmund Gunter created the logarithmic scales (lines, or rules) upon which slide rules are based, it was Oughtred who first used two such scales sliding by one another to perform direct multiplication and division; and he is credited as the inventor of the slide rule in 1622.
- Slide rule – Wikipedia
Jump to History – The slide rule, also known colloquially in the United States as a slipstick, is a mechanical analog computer. … The Reverend William Oughtred and others developed the slide rule in the 17th century based on the emerging work on logarithms by John Napier.
Basic concepts · Operation · Physical design
- Oughtred Society Slide Rule History. – The Oughtred Society
Since logarithms are the foundation on which the slide rule is built, its history rightly begins with him. His early concept of simplifying mathematical calculations …
- Slide rule | mathematics | Britannica.com
In 1632 another English mathematician, William Oughtred, designed the first adjustable logarithmic rule; as shown in the photograph, it was circular. … In 1814 the English physician Peter Roget (of Roget’s Thesaurus) invented his “log-log” slide rule for calculating powers and roots of numbers.
- William Oughtred and the History of the Slide Rule – ThoughtCo
Around 1622, the circular and rectangular slide rule was invented by Episcopalean minister William Oughtred.