Perrygraf Cutting Fluid Guide/Cutting Speed Calculator for Texaco

Since 1934 Perrygraf (or Perry Graf) Corporation of Maywood, Ill., has prepared a variety of sliding charts and rules for advertising purposes. See 1979.3074.03 for company history. Perrygraf designed this white, green, and red rectangular cardboard instrument, held together with six metal rivets, in 1946 for The Texas Company (Texaco) of New York, N.Y. On one side is a "Cutting Fluid Guide," which indicates the type of Texaco cutting oil that should be used for various methods of cutting different groups of metals. The first four groups, of ferrous metals, are listed in a table on the other side of the instrument. A table for the last five groups, of nonferrous metals, appears on one side of the slide. Below the table of ferrous metals is a "Cutting Speed Calculator" with a logarithmic scale for computing the cutting speed in revolutions per minute, given the surface speed in feet per minute and the work diameter in inches.

The Texaco logo in the front lower right corner is the form used between 1936 and 1963. The back lower left corner is marked Printed in U.S.A. 2–46. Perry Graf Corp. Maywood, Ill.

References: Tom Wyman, "Slide Chart Calculators – A Modest Proposal," Journal of the Oughtred Society 13, no. 1 (2004): 6–10; "Texaco," Logopedia, http://logos.wikia.com/wiki/Texaco.

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