Moriarty was muttering to himself, figuring with slide rule, pencil and paper.
He readjusted the slide rule and slid the hairline over a bit.
In 1622, Willliam Oughtred invented the slide rule for calculations.
Should the slide rule be placed in the hands of a boy before, or after, he has mastered the theory of logarithms?
He sat in the big chair with his feet sticking straight ...