Slide rule is a mechanical analog computer which is used primarily for multiplication and division, and for functions such as exponents, roots, logarithms, and trigonometry.
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16 Facts About Slide rule
2.
The slide rule is closely related to nomograms used for application-specific computations.
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3.
Binary Slide Rule manufactured by Gilson in 1931 performed an addition and subtraction function limited to fractions.
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4.
Width of the slide rule is quoted in terms of the nominal width of the scales.
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5.
One slide rule remaining in daily use around the world is the E6B.
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6.
Russian circular slide rule built like a pocket watch that works as single cursor slide rule since the two needles are ganged together.
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7.
In 1722, Warner introduced the two- and three-decade scales, and in 1755 Everard included an inverted scale; a slide rule containing all of these scales is usually known as a "polyphase" rule.
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8.
The duplex Slide rule was invented by William Cox in 1891 and was produced by Keuffel and Esser Co.
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10.
In 2004, education researchers David B Sher and Dean C Nataro conceived a new type of slide rule based on prosthaphaeresis, an algorithm for rapidly computing products that predates logarithms.
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11.
For example, the Fisher Controls company distributed a customized slide rule adapted to solving the equations used for selecting the proper size of industrial flow control valves.
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12.
Department of Defense publication from 1962 infamously included a special-purpose circular slide rule for calculating blast effects, overpressure, and radiation exposure from a given yield of an atomic bomb.
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13.
Importance of the slide rule began to diminish as electronic computers, a new but rare resource in the 1950s, became more widely available to technical workers during the 1960s.
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14.
Slide rule requires the user to separately compute the order of magnitude of the answer in order to position the decimal point in the results.
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15.
Typical arithmetic precision of a slide rule is about three significant digits, compared to many digits on digital calculators.
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16.
The E6B circular slide rule used by pilots has been in continuous production and remains available in a variety of models.
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