Original 1921 electrical trade vintage magazine ad for the WARD LEONARD ELECTRIC COMPANY. Main office and plant were located in Mount Vernon, NY.

Manufacturers of Vitrohm Resistor Units - Resistor Units as Locomotive Headlight Dimmers.

The reliability and rugged construction of locomotive headlight dimmers is of paramount importance in yard and road service. Front and rear headlights must be dimmed and brightened constantly. The 'resistance units' in the dimmer must be able to stand the heavy jolting and vibration of railroad service. Ward Leonard Vitrohm Resistor Units are used in standard railroad headlight switches of approved design. Jolts and jars, heat, cold, moisture or even hot, corrosive gases cannot affect the resistance wires, which are completely sealed within vitreous enamel.

Has product images, description and applications provide product details.

Unbound from a rare 1921 Electrical World magazine, this unique old one-page technical magazine advertisement would display beautifully matted and framed. Nice graphics. A fabulous addition to your retro electrical industry library.