The Turn Of The Century Electrotherapy Museum
http://www.electrotherapymuseum.com




Micrometer Spark Gap Power Supply



Pancake Coil powered by cigar-box tank circuit

Box contains 1650V 10mA transformer and .0315 mfd condenser @ 7kV.   [ (7) .22 mfd  1kV condensers in series]




Note the position of the conical adjustment - Gap is open 1/16".


As the cone is pushed or pulled the gap is adjusted - a 3" portion of the cone adjusts the gap by a maximum of 1/16".




Hints of what's inside...


















Internal view...