Bygrave slide rule

The Bygrave slide rule is a slide rule named for its inventor, Captain L. G. Bygrave of the RAF.

For the Bygrave position line slide rule, see Bygrave slide rule Bygrave is a village and civil parish in the North Hertfordshire district of Hertfordshire, England, about 2 miles north-east of Baldock.

There are two main types of cylindrical slide rules: those with helical scales such as the Fuller, the Otis King and the Bygrave slide rule, and those with bars, such as the Thacher and some Loga models.