What is it?
See if you can guess what this object is.
by Brian Ayres
posted by Goldfields Image Makers at 2:43 pm
04 July 2007
Meetings are held at the Maryborough Highland Society on the first Wednesday of the month.
posted by Goldfields Image Makers at 2:43 pm
2 Comments:
Drawing slide rule scales around a circle enabled a more compact instrument to be produced. A circular slide rule with a 3-inch diameter can provide a 10-inch scale. Nevertheless, circular slide rules were never very popular. There could be problems of parallax in reading the scales but for their size they could be surprisingly accurate.
A variety of circular slides rules were manufactured by Concise in Japan. These were often supplied with a firm’s name on for use as promotional give-aways.
Whoever posted the comment you are spot on with your answer. See how good you are with my other mystery object as it has no visible brand name
Brian Ayres
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