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Calculator

The British Calculator

Category

Scientific instruments

Date

Unknown

Materials

Brass, ivory, metal and leather

Measurements

9 x 135 mm

Place of origin

United Kingdom

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Collection

Tyntesfield, North Somerset

NT 10637.2

Caption

In the pre-decimal days of British currency, BriCals could be used to total sums of money. Ivory pegs, placed into the slots at the appropriate place and then pushed clockwise, created the total seen in the four results windows.

Summary

A circular manually operated calculator made of white metal and brass, engraved with numbers and fitted with further numbers and dials that are interchanged by two accompanying ivory pegs. Engraved on front face The British Calculator ( Model B ) For Compound Addition Patent. Engraved on rim T.J. Marshall Manfr. Stamped number on rim 1015. With a black leather pad attached to the base, it is located in a blue leather bound box with 'The British Calculator' printed in gold coloured lettering on the surface.

Provenance

Purchased from the estate of the late Lord Wraxall with the assistance of the NHMF and donations from members and supporters.

Marks and inscriptions

The / British Calculator / (MODEL B) / FOR COMPOUND ADDITION / PATENT (engraved lettering on surface)

Makers and roles

The British Calculator

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