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Guy's Calculating Machines

Guy’s Britannic

Guy's Britannic

Pinwheel calculator with 9-digit setting register, 18-digit accumulator register, 10-digit revolutions register.

Made in England by Guy's Calculating Machines Ltd., Wood Green, London N22.
Distributed by Muldivo Calculating Machine Co. Ltd.,49 Queen Victoria Street, London EC4.

Probably made between the late-1930s and 1960.

255 x 118 x 100 mm (10" x 4.7" x 4").

Guy's Calculating Machines Ltd. was the only British manufacturer of the Odhner type pin-wheel calculator. The Britannic is a copy of the Brunsviga first produced during the first world war[1]. It embodies improvements patented by Frank E. Guy, including a setting-lever clearer device for zeroing the levers by a single movement, interlocking mechanism, and a new barrel construction giving greater rigidity to the setting levers.
The Muldivo Calculating Machine Co. Ltd. bought Guy's Calculating Machines from the brothers Guy in about 1939 and made a Thales-type machine there after the War. It moved to Witham, Essex, in 1965 and was sold by Muldivo in about 1969, by which time it had become a general precision sub-contracting works.

Guy’s Britannic
Guy’s Britannic
Guy’s Britannic

The calculator with its cover on.

For information on performing the basic arithmetic operations see Operating a Pinwheel Calculator in the "Collecting Calculators" section of this site.

For details of the pinwheel mechanism click here.

 

Reference:

  1. Leslie John Comrie, "The Application of Commercial Calculating Machines to Scientific Computing", Mathematical Tables and Other Aids to Computation, 2, 1946b, 149.
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