Original 1943 electrical trade vintage ad for OHMITE MANUFACTURING COMPANY.  Main office and plant was located at 4801 Flournoy Street, Chicago, IL

Manufacturers of Rheostats and Resistors.

Ohmite Rheostats and Resistors Used in Electron Microscope. 

This amazing electron microscope, developed by RCA Laboratories, explores new sub-microscopic worlds not revealed by light waves. It is from 50 to 100 times more powerful than the strongest optical microscope. Magnification up to 100,000 diameters are obtainable.

Unbound from a 1943 electrical engineering magazine, this unique old one-page advertisement would display beautifully matted and framed. Nice graphics. World War 2 propaganda. A fabulous addition to your retro electrical library.