Plus model 509/S
Sterling currency, key-driven ("Comptometer") type, with abbreviated keyboard (only has keys 1 to 5). To enter a number greater than 5 two or three keys have to be pressed in succession in that column.
It is a model 509/S where the 5 denotes the abbreviated keyboard (keys up to 5), the 09 denotes the 9 columns of keys, and the S denotes a Sterling currency version.
The calculator in the photograph above displays the total:
£1,234,567 17s 11d.
230 x 190 x 124 mm (9" x 7.5" x 4.9").
This casing style was replaced by a more modern version in 1958.
Made by Bell Punch Co. Ltd. in Britain, distributed by Sumlock Ltd.
The machine illustrated has serial number 509/S/95.899.
There are excellent photographs and descriptions of the Plus Adder mechanism at John Wolff's Web Museum site. These are accessed from the Comptometers and Key-Driven Calculators section on that site.
Text & photographs copyright © 2002 - 2023 Nigel Tout, except where noted otherwise.
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