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11615
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DISCOVER
SHELLHARBOUR
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Addiator Calculating Machine
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DESCRIPTION
Title
Addiator Calculating Machine
Object Type
Object
Date
c.1940
Description
Addiator Calculating Machine.
Addiator's were used to add and subtract numbers. They were the pocket calculators of the day.
Creator
Duplex
Provenance and Signifcance
This pocket slide ruler was owned by Franz (Frank) Behrens of Shellharbour.
Donor
Beehrens, Frank
CHARACTERISTICS
Material
Sheet metal.
Dimensions
8cm x 12cm
CLASSIFICATION
Primary
Sciences
Secondary
Instruments - Mathematical
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Duplex,
Addiator Calculating Machine
(c.1940). Shellharbour City Council, accessed 21/01/2026, https://discover.shellharbour.nsw.gov.au/nodes/view/11615