- 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.
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
Hoskins, there, he's going to be a slide-rule, jus' you wait and see.Breaking Point
James E. Gunn
Seaton threw down the papers and picked up his slide-rule, a twenty-inch trigonometrical duplex.Skylark Three
Edward 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 Telstar
- 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
Word Origin and History for slide-rule
Online Etymology Dictionary, © 2010 Douglas Harper