= Bygrave slide rule
{wiki=Bygrave_slide_rule}
The Bygrave slide rule, also known as the Bygrave calculating rule, is a type of analog computing device used for performing various mathematical calculations, particularly multiplication, division, and functions such as square roots and trigonometric calculations. Designed by the British engineer William Bygrave in the 19th century, this slide rule features a unique arrangement that allows for quick and efficient calculations.
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