The Turn Of The Century Electrotherapy
Military Quenched Spark Gap Tests
9" Pancake Coil: 500 Turns of 34 AWG wire
This is working well on high power. Discharge will exceed 12" if sufficiently insulated.
A sidewards view showing the gap. Note there is no light from the gap as they are enclosed in the washer sections.
Frank sent this Quenched Gap that contains a combination of two companies disks - one that is silver plated copper disks which
have been formed to the desired shape, and a second type that is tungsten soldered to brass machined disks.
This gaps are based on the Lepel and Telefunken patents, the original Quenched Gap being patented by Kinraide in 1899 6 years earlier.
The discs are made with a recess to accept an insulating washer. Without the recess the arc occurs at the edges of the washer instead
of the face of the disk. Here I am using filtration paper.