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2010/1/170 Mechanical pin wheel calculator, SOLO, plastic / metal, made by the Solo Calculating Machine Co Ltd, Japan, 1960s. Click to enlarge.

Solo pinwheel calculator

This object is part of a collection relating to the history and development of calculating devices assembled by Assoc Professor Allan Bromley of Sydney University, comprising mathematical instruments, slide-rules, mechanical and electronic calculators, electronic analogue computers, computer components, kit computers, education computers, and associated ephemera.

Allan Bromley was a lecturer and researcher at the University of Sydney Basser Department of Computer Science from 1978 until his …


Object No.


Object Statement

Mechanical pin wheel calculator, SOLO, plastic / metal, made by the Solo Calculating Machine Co Ltd, Japan, 1960s

Physical Description

The Solo mechanical pinwheel calculator consists of seven vertical rows of hand adjustable setting levers, connected to an internal pinwheel and housed within a green plastic frame. Each of the seven rows contains a set of teeth and are numbered on the right, '9:1' for additions and on the left, '1:9' for subtracting. The values of each row, from right to left are single units, 10's, 100's, 1000's 10,000's, 100,000's and 1,000,000's. In there centre of the teeth there are 7 windows, used for displaying the numerals based on the calculations being made. A plastic lever on the right hand side of the device can be pressed to resert the windows to zero. The base of the calculator has four circulat rubber feet to avoid slipping while in use.


'SOLO' logo on the front
'MADE IN JAPAN' on the base



100 mm


114 mm


95 mm


Credit Line

Donated through the Australian Government's Cultural Gifts Program in memory of Associate Professor Allan Bromley, 2010

Acquisition Date

19 January 2010

Cite this Object


Solo pinwheel calculator 2022, Museum of Applied Arts & Sciences, accessed 23 March 2023, <>


{{cite web |url= |title=Solo pinwheel calculator |author=Museum of Applied Arts & Sciences |access-date=23 March 2023 |publisher=Museum of Applied Arts & Sciences, Australia}}