# slide rule

- a device for performing mathematical calculations, consisting essentially of a ruler having a sliding piece moving along it, both marked with graduated, usually logarithmic, scales: now largely replaced by the electronic calculator.

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## Origin of slide rule^{}

1655–65 for earlier sense; 1875–80 for current sense

Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

## Examples from the Web for slide-rule

### Historical Examples

#### Hoskins, there, he's going to be a slide-rule, jus' you wait and see.

Breaking PointJames E. Gunn

#### Seaton threw down the papers and picked up his slide-rule, a twenty-inch trigonometrical duplex.

Skylark ThreeEdward Elmer Smith

#### I watched him copy the indicated figures, surround them with formulas, and solve mysterious problems with a slide-rule.

#### The slide-rule (see Calculating Machines) is a simple apparatus for the mechanical application of the methods of logarithms.

#### This was a little rocket canister which had just enough poof, the slide-rule boys had said, to stop the rotation of the bird.

The Trouble with TelstarJohn Berryman

# slide rule

- a mechanical calculating device consisting of two strips, one sliding along a central groove in the other, each strip graduated in two or more logarithmic scales of numbers, trigonometric functions, etc. It employs the same principles as logarithm tables

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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

## Word Origin and History for slide-rule

Online Etymology Dictionary, © 2010 Douglas Harper