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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 2020

The museum will remain closed this summer and fall.  

Depending on the status of covid-19, The Leduc Country Lights may be back November 28 to Dec 31, 2020, however the EPHF museum will be closed during this event.

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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