‘Brunsviga’ Model 20 mechanical calculator (c.1960). It was in production from 1934 to 1963. A desk-top mechanical calculator for multiplication and division.
The model in the collection has a late serial number and was probably manufactured around 1960. It weighs 12 kg. Machines like these were in universal use wherever number crunching was required.
It was used in the City Engineer’s Department of the City of Edinburgh Corporation.
This item is not in working order.