6904-155
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Item no.: 159068290542
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6904-155 GILSON Midget circular slide rule. Aluminum, 3-7/8" diameter, in its original leather case. The Gilson Co., of Niles, MI, was formed in 1915, this rule represents Type III of its popular "Midget" model and was manufactured between 1922, when the patent was issued, and 1927, when the company moved to Florida. Immaculate condition. A copy of an article from the journal of the Oughtred Society on the history of Gilson is included. Fine (TBI400) 100 - 200
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