滑すべり尺じゃく

noun

slide rule

A mechanical analog computing device consisting of two logarithmic scales that slide against each other, used for multiplication, division, and other calculations. Now largely replaced by electronic calculators.

• 祖そ父ふはまだ滑すべり尺じゃくで計けい算さんしている。

  My grandfather still calculates with a slide rule.