Monroe's 'Full Automatic' calculating machine, 1922.
2 9 c m
actual image size: 32cm x 21cm

Monroe's 'Full Automatic' calculating machine, 1922.

© Science Museum / Science & Society Picture Library


The design for this model was completed in 1922. It was the first machine to offer fully automatic multiplication and division. There was a keyboard setting mechanism, combined with a slide at the back for 'stepping' in the operations of multiplication and division. Monroe machines were originally the work of F S Baldwin, the inventor of the barrel calculating machine, and J R Monroe. Their first machine in 1912 began the trend towards full keyboard general purpose calculating machines.

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