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Summary: Technical film focusing on how vacuum tubes operate.
Description: Reel 1: “Electron Theory and The Diode Tube” - how electrons flow and diode tubes work.
Reel 2: continuation of reel 1. “The Diode Tube as a Rectifier” - “Half Wave Rectification” - “Full Wave Recification”.
Production Country: United States of America
Production Details: US War Department. (Production sponsor)