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Vintage Engineering Sonar Propagation and Transducer Computer Slide Calculator  For Sale

Vintage Engineering Sonar Propagation and Transducer Computer Slide Calculator 
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Vintage Engineering Sonar Propagation and Transducer Computer Slide Calculator :
$12.00

With instructions. Published by Sperry Gyroscope Company, Surface Armament Division, Great Neck New York. Copyright 1958 by Perrygraph Corp, Maywood IL. Excellent condition. Graphic calculation aids such as this were widely used by engineers and designers in the days before computers. Vendors of components distributed them free to their customers.
Please see my other listings. I plan to list a number of slide rules as well as several engineering selectors, nomographs and charts and a couple analog flight navigation computers. I do combine shipping on all items purchased and paid for on the same day.
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