Stone Vintage Radio Museum - Antique Radios, Wireless, Crystal Sets, Tubes, and Valves

L. E, Knott Apparatus 4" Induction Coil. Large induction coil that could be used for spark transmissions or in the lab. It measures 22 X 11 inches and the coil is 10 inches long by 5 1/2 inches in diameter. You can see from the pictures it works.

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