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Plus Adder D calculator

Plus Adder D

Decimal, key-driven ("Comptometer") type, with abbreviated keyboard (only has keys 1 to 5). To enter a number greater than 5 two keys have to be pressed in succession in that column.
The lever on the right is for clearing the total.

The photograph above shows a total of 12,345,678.

230 x 153 x 100 mm. (9" x  6" x 3.9").

Serial no.: D/A5128.

Made in England.

This is one of the first Bell Punch calculators, which were based on the Petters design that Bell Punch bought from that company in 1936. See the patents listed underneath the machine in the photograph below.
The case is typical of the early models in being made of Bakelite. The mechanism of these machines operates on the downwards stroke of the keys and there is no interlocking between the keys to prevent more than one key in a column being inadvertently pressed at the same time.

This machine is unusual in two ways:

• Firstly there is no trade name or manufacturer marked on the calculator but it has a Bell Punch model code and the patent numbers used by Bell Punch.
• Secondly, the plate on the bottom of the machine shows the original model type "S" scratched out and model type "D" substituted.
  So perhaps only type "S" labels were available and the "D" was substituted for the "S", or the machine was converted at some point to a decimal type "D" from a type "S" (originally for use with the old British £sd currency).

Text & photographs copyright © 2002 - 2023 Nigel Tout, except where noted otherwise.

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