The Turn Of The Century Electrotherapy Museum http://www.electrotherapymuseum.com  16. July 2008 Quenched Spark Gap March 1917 Electrical Experimenter, Chas S. Ballantine      |
The Turn Of The Century Electrotherapy Museum http://www.electrotherapymuseum.com 16. July 2008 Quenched Spark Gap March 1917 Electrical Experimenter, Chas S. Ballantine |