slide rule

The engineers had slide rules and mechanical calculators but didn’t like doing calculations.

I walked to Greenwich, studying the slide rule for measuring of timber, which is very fine.

I swallowed, and took out my notebook and pencil, and laid my pocket slide rule in front of me.

He readjusted the slide rule and slid the hairline over a bit.

He sat in the big chair with his feet sticking straight out in front of him and played with a slide rule.

The use of a slide rule will make this transference to a new average very easy.