How Dr. Edward Weston's electrical measuring devices worked in the 1920s

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Image Number: 6177-V53863128Royalty FreeCredit Line:DVArchive/Retrofootage/DV Archive/SuperStockCollection:DV ArchiveStory:Historical Scientific InstrumentsContributor:DVArchive/RetrofootageModel Release:NoProperty Release:NoDuration:0:00:56Frame Rate:25 FPSResolution:1920×1080
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