The above pictures are of a double coned coil I acquired. I was
informed by the person who owns the mold for this coil that it was designed by
Nikola Tesla, himself and that the mold was given to his father. Each cone
is 6" in diameter and 6" in height. Each cone has approx. 127ft
of wire. The end to end inductance of the secondary is 2.36mH. The
quarter wave length frequency would calculate to 1.937MHz for a straight
solenoid but this coil seem to resonate at about 1.12MHz. The two cones
are connected in the middle such that the entire length is one wire. There
is no tapping point between the two coils. I had to replace the copper
primary due to age and wear but I am keeping the old copper tubing as
verification for the coil's age. This coil was likely built in the early
1900s and is identical in layout to Tesla's patent schematics from the late
1890s.
Rumor has it that this coil exhibits antigravity properties. But I have
not seen antigravity effects, yet.
