Seaton threw down the papers and picked up his slide-rule, a twenty-inch trigonometrical duplex.
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.
I watched him copy the indicated figures, surround them with formulas, and solve mysterious problems with a slide-rule.
Hoskins, there, he's going to be a slide-rule, jus' you wait and see.