Sumlock Comptometer 912/S

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SUMLOCK model 912/S Sterling currency "Comptometer".

This is a full-keyboard direct action keyboard calculator of the "comptometer" type  for Sterling currency calculations.

330 mm x 315 mm x 135 mm (13" x 12.5" x 5.5"), 7 Kg (15.5 lbs).

Manufactured about the 1950's-1960's.
Made by Bell Punch Co. Ltd. in Britain, distributed by Sumlock Ltd.

The machine illustrated has serial number 912/S/17.161

This machine has a full keyboard except for the Pence column where there are only 9 keys (1-9) instead of 11 in a fully keyed model, although the accumulator for this column will display up to 11. The tens of shillings column only has the one key necessary.

To enter 11 in this column the operator has to press in turn the (9) key and the (2) key.This plays off ease of use compared with lower manufacturing cost in that more standard components can be used.

This compometerr was knidly donated by Lloyd Boardman

Manufacturer: Sumlock
Date: 1st January 1950

This exhibit has a reference ID of CH7003. Please quote this reference ID in any communication with the Centre for Computing History.


Sumlock Comptometer 912/S

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