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A
History of the Festus Mfg. Co.
and its successor
The Acu-Rule Mfg. Co.
Makers of the ACU-RULE and ACUMATH Brand Slide Rule
also information about The
Slide Rule and Scale Engineering Co.
Copyright George E. Keane
November 30, 2004
Festus, Missouri.
This is a redesigned version updated and published November 24, 2006
Copyright November 24, 2006
This slide rule is a near mint example of a model 10J. These slide
rules had the numerical scales printed on paper that was then glued to the wood body. The wood was milled
so that a raised shoulder would prevent wear on the paper.
This model had a flat, 1/8 inch beveled edge, red line Lucite cursor. This and three other
models were the first production models made in Festus,
Missouri. The price for this slide rule was $18.00 per gross or twelve and a half cents.
Above is a 1938 model 50 with paper scales.
Note that the "A" scale has been lost. This
model has a 10 inch ruler and a metric ruler
on the edges
This material is in book form in the
reference section of the Festus, Missouri library and the Abraham Lincoln Presidential Library,
Springfield, Illinois. About 95 pages of detailed business
records, additional pictures, newspaper clippings and other items of
documentation are in the book plus the text from the first version of
this web page.
This web page is
the result of three years research and many revisions.
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