The Turn Of The Century Electrotherapy Museum http://www.electrotherapymuseum.com   Single Pole / Unipolar Kinraide Coil Brush Discharge Before staining... Top view...Pancake Coil, Condenser, Spark Gap, Transformer, Knife Switch On/Off 3000V 110mA Pancake Coil Awesome .01 mfd transmitting cap from Frank  and Tungsten Spark Gap More projects: 500 turn Pancake Coils... An interesting uranium glass Geissler Tube from Frank Note the white vacuum.   This is normal air pumped down to geissler vacuum, yet has more resistance than the normal Violet or red vacuums... Shows the green phosphorescence of the glass Transformer laminations 1 5/16" x random lengths.  For a future project in building wireless [telegraphy] transformers... Sumo is working hard... Mejla too Io is ready to hang out in the museum out back! Sumo and Juju