How to Use a Slide Rule, Eugene* Dietzgen Co. -1942 owner's and user's manual F*S Singer Featherweight 5 inch high liquid crystal

5 inch high liquid crystal display is easy to read

TEL –75mV

Note the vest is an open front

These lenses were made for the US military during WWII to mount in K-21 Aerial cameras and used in reconnaissance missions

How to Use a Slide Rule, Eugene* Dietzgen Co. -1942 owner's and user's manual F*S Singer Featherweight 5 inch high liquid crystalThis is a high quality reprint of the Eugene Dietzgen Co. "How to Use a Slide Rule" manual dated 1942. The Slide Rule is an instrument for facilitating calculations and is an indispensable aid not only to the engineer and scientist with their involved problems, but also to the accountant, statistician, manufacturer, merchant, importer, teacher, student, or anyone who has calculations to solve. This is the complete Eugene Dietzgen Co. manual, note that