Pamphlet, Trigonometry Tables and Involute functions

In the mid-twentieth century, American tool manufacturers sometimes distributed trigonometry tables that included advertisements for their products. This small paper pamphlet includes definitions of the sine, cosine, tangent, cotangent, secant and cosecant as well as formulas for finding the length of sides for right-angled and oblique triangles when different angles and sides are known. It then gives tables to five places of values of the six trigonometric functions mentioned, as well as a table of decimal equivalents. In addition to this material, the pamphlet has a section on involute function that includes tables and formulas for spur and helical gears.

Also shown are precision metal cutting tools manufactured by Illinois Tool Works, which billed itself as “Headquarters for Engineered Cutting Tools.”

The pamphlet was owned by machinist and museum specialist George A. Norton. The copyright date is 1954.

Compare 1986.3078.01.

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