Circular slide rules

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Gilson Atlas spiral slide rule

Vintage (c.1940s) Gilson spiral slide rule measures 8 3/8" in diameter. Metal Marked on one side "ATLAS Slide Rule" and Copyrighted Made in USA Gilson Slide Rule Co. Stuart, Ca. on the other.

D Scale length: 15708 mm. Significant digits: 4.8 to 5.

Copyright 2012, Dave Hoyer.