On the front side, this appears to be a very ordinary general purpose slide rule from one of the major German manufacturers, using the brand name Castell.
But turning it over reveals an Addiator manual adding machine, so that addition and subtraction can be carried out as well as multiplication and division. The stylus used with the Addiator is stored in a hole in the left end of the rule. The pull bar for clearing the addiator display is at the other end.
The trigonometric scales often found on the back of slide rules have been displaced to one edge with a special extended cursor. Some log-log scales are also accessible at the back, making this a very versatile instrument.
It belonged to former UQ Physics staff member Dr Jim Crouchley.
This item is part of the UQ Physics Museum Good Old days of Calculation Tour
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