Accession No
6149
Brief Description
mechanical calculator, by London Computator Corporation Ltd., English, 1940 (c)
Origin
England; SW1; London; 39 St. James’s St
Maker
London Computator Corporation Ltd.
Class
calculating
Earliest Date
1940
Latest Date
1945
Inscription Date
Material
metal; plastic; rubber
Dimensions
Length 227mm; breadth 185mm; height 130mm
Special Collection
Hookham collection
Provenance
Donated in 1987.
Inscription
‘PLUS’ (on back)
Description Notes
Mechanical calculator by London Computator Ltd, model 509/F/55.186.
Green-painted metal casing on 4 rubber feet. Plastic keys at top for entering numbers in green and white. Resetting lever is at right of keys. Ten-digit display under perspex cover with pivoted metal cursor between each position for marking decimal point.
Guarantee, list of patents, and list of branches are on underside.
Fair condition: complete; casing scratched.
Label on reverse is coming unattached.
Handel to the resetting lever is missing.
References
Events
Description
The number is entered onto the display upon the upstroke of the key, i.e. when it has been let go. There are 6 decades of £ keys, with shillings and pence keys in columns on the right, all abbreviated to 1 to 5. To enter a number between 6 and 9, two keys have to be pressed in succession in that column to give the required number. The lever on the right is for clearing the total.
01/08/2007
Created by: S Davis on 01/08/2007
FM:45064
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