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Erschienen in:
2020 | OriginalPaper | Buchkapitel
14. Slide Rules
verfasst von : Herbert Bruderer
Erschienen in: Milestones in Analog and Digital Computing
Verlag: Springer International Publishing
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Abstract
The chapter “Slide Rules” describes once widespread mathematical instruments designed on the basis of the logarithms discovered by Jost Bürgi (Switzerland) and John Napier (Scotland). These instruments reduce multiplication to the addition and division to the subtraction of line segments. One also speaks of nomography. There are different types of instruments: linear slide rules, circular slide rules, cylindrical slide rules, and pocket-watch slide rules. Cylindrical slide rules have scale sections arranged parallel to each other or in a helical arrangement. This analog calculating instrument dates from the seventeenth century and was in use until the 1970s. The English mathematician William Oughtred is considered the inventor of the slide rule. The largest mass-produced cylindrical slide rule, the Loga calculator, has a scale length of 24 m. The longer the scale, the greater the accuracy of the instrument. For the Swiss-made Loga cylindrical slide rules, the serial numbers are related to the scale length.