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Impedance Bridge

Circa 1960's


Impedance bridge theory developed in 1830's and in the 1840's, C. Wheatstone improved it for accurate resistive/impedance testing. Note "magic eye" tube lower center.

Categories: Instruments Collection

Author: ephf

Edmonton Power Historical Foundation is a non-profit society dedicated to preserving the history of electric power in the City of Edmonton and the Province of Alberta, for the education and entertainment of current and future generations.

Edmonton Power Historical Foundation

Hours of operation 2021

The Lesco Distributors Pro Show n' Shine for Semi Trucks on September 18 was a resounding success, and with that the EPHF museum will be closing for the season (except for visit by appointment). But the Leduc West Antique Society grounds will once again open for the Leduc Country Christmas Lights in December 2021. It promises to be another breathtaking stroll through a magical winter wonderland. Come on out and visit us!

We are located on the grounds of the Leduc West Antique Museum. Travel 5 miles west of Leduc on Highway 39. Go north on Range Road 260 (Cohne Dale Road) for about a mile and the museum will be on your right.

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