Original 1943 electrical trade vintage ad for SOLA ELECTRIC COMPANY.  Main office and plant was located at 2525 Clybourn Avenue, Chicago, IL.

Manufacturers of Constant Voltage Transformers.

Burned Out at the moment it was needed most.  With Constant Voltage This Might Have Been Avoided.

This tube might have been transmitting orders to a battle fleet, or controlling some delicate operation in a war plant, or guiding an airliner through a storm "upstairs".  Then, a sudden surge of line voltage, a tiny filament gives way, and thousands of tons of fighting ships are out of contact with land, a whole production line has broken down, or a slender silver airliner lies wrecked against a peak.

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.