[24k] Bill standing next to coil. We had to drop the primary down to within
inches of the concrete floor to get maximum ceiling clearance. The proximity
to the floor did not affect operation one iota.Wild Bill Emery and I (with help from Max Hempel) have built a large coil. 19 inches diameter, 57 inches long, wound with 14 gauge enamel wire. Caps are three to four 0.02 ufd pulse discharge caps in parallel. Gap is a tungstan rotary in series with a cylinder gap made from 3 inch diameter copper pipe. Power is a 14.4 kv, 15 kva pig. The most current top is a 6 foot diameter, 22 inch cross section toroid made from styrofoam sheets and aluminum screen wire and aluminum tape. Largest sparks indoors are 12 feet - we will be setting up outdoors soon and expect to push out to near 15 feet.
[63k] Note the spark headed toward the camera, striking a ground wire which
was suspended from wall to wall.
[59k] A rather weak spark hitting the door - 11 feet, nice strong floor hits.
[55k] The spark on the left actually nailed the aluminum ladder.