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I recently acquired an old Gilson circular slide rule, Gilson no longer exists and circular slide rules, like the conventional type are no longer made. In any event, this particular circular slide rule is a Gilson Atlas 8"/21cm model. It has trig scales and decimal equivalents on one side, with a single arm. The other side has 2 arms, Atlas Spiral Scales with which the user can solve numerical problems, and obtain logarithms to 5 decimal places if desired. My old HP 11C can do more, a lot more, but I'm curious re this circular rule.

The slide rule came without any sort of manual. I found a brief sketchy explanation on the Internet, but would like to obtain a more detailed explanation if such is available. Any suggestions or direction appreciated. Thanks in advance.

Hi,

perhaps this manual helps.

Best regards

Karl

Quote:and circular slide rules, like the conventional type are no longer made.

Concise Co. Ltd. in Japan is still making circular slide rules. See for example http://www.concise.co.jp/en/products/det...oduct_id=7

Garth:
OOPS, you caught me. I should have said that the circular slide rules similar to those made by Gilson are no more.

(11-09-2015 07:39 AM)Karl-Ludwig Butte Wrote: [ -> ]Hi,

perhaps this manual helps.

Best regards

Karl

Karl:

Thanks for the thought and attention but the manual you referenced does not address the spiral scale, the part that I'm interested in.

(11-09-2015 01:36 PM)Thomas Klemm Wrote: [ -> ]

Thomas:

Thanks for the thought. Unfortunately, it appears that the manual you referenced does not cover the spiral scale, the aspect that I'm interested in.