The Turn Of The Century Electrotherapy
Micrometer Spark Gap for Tesla Coils
(When 1/1000th of an inch accuracy isn't enough)
10,000th of an inch and beyond!
Brass, Phosphor Bronze, Tungsten, and Hardened Chromed Steel!
Brass Barrel, 1/2" Ball Bearing, Spring, Tungsten Contact, 5/16-40 Conical
Adjusting Screw, Bearing Contact Mount, End Pieces
Several variations, one with theoretical 1/1,000,000th of an inch accuracy
Note position of cone with respect to ball bearing
Cone is now raised and ball is retracted