Perrygrafs got their name from Perry Graf Corp, of Maywood, Illinois, which made slide charts and special slide rules, usually out of paper or cardboard, and almost always as promotional items for other companies. (I have an original Perry Graf perrygraf...) Perry Graf Corp was sold to Nashua Corporation in 1968, and became Perrygraf, and in 1988 to American Slide Chart.
Flight computer, Circular
Copyright 1941 Perry Graf Corp., Maywood, Ill. This is one of the Perry Graf perrygrafs, and probably dates to the early sixties. It is a promotional item for "Aero Insurance Underwriters".
English/Metric Converter, 8"
Made by Perrygraf, by then a division of Nashua Corp. This one was made for "Noryl Thermoplastic Resins", a division of General Electric.
Metric Converter, 8"
Made by Perrygraf for Valley Steel Products Company.
SI Metric-English Converter, 8"
Made by Perrygraf for the U.S. Department of Transportation Federal Highway Administration.
Air Navigation Computer, Circular
U.S. Coast and Geodetic Survey Air Navigation Computer, almost appears homemade. Owner "W. J. Sullivan".
Guy Rule, Circular
Made by Billcocks-Miller for A.T.& T. Co. I believe this refers to the guy wires that hold up telephone poles.
Hydraulic Calculator, 9"
I received this new at a conference in 1989. It was made by the American Concrete Pipe Association.
Danger Zone, 6"
This is probably my oldest perrygraph. It was made for (and probably by) Aetna Casualty & Surety Co., and bears a 1937 copyright date. It shows braking distances for various speeds and reaction times.
Loan Repayment Guide, 9"
Another modern perrygraf, this one made by Manufacturers and Traders Trust Company (M&T Bank).
Artillery Rule, 105mm Howitzer M2A1 & M4, 12"
This was used by the U.S. Army for aiming and firing Howitzers. I haven't played with it much because the cursor is stuck. I'm putting it here, rather than up above with the slide rules, because it has no slide, so it doesn't really qualify as a slide rule.
© 2003 W. E. Johns