The Science Place in Dallas has a large Tesla coil, built by Lloyd Ritchie. It is wound on a fiberglass form 24 inches in diameter and about 6 feet long. The primary looks to be a couple turns of welding cable wound on the bottom of the secondary. It has no toroid top (Lloyd does not believe in top terminals) and makes 6 foot sparks.
[22k] Rear view of coil, showing primary connections.
Below are some miscellaneous pictures, including some hot flames, weird people, and a visit to Richard Hull's in Richmond Virginia.
[31k] Wild Bill Emery and his first look at Richard Hull's magnifier #11-E. The extra coil is that little green coil above Bill's head. It is only 4 inches in diameter and 12 inches long, and has made sparks in excess of 10 feet with only about 7 kVA input. Richard believes in large toroids, which you can see here dwarfing the tiny extra coil. Close-up view of the extra coil and the toroids. Richard has hung the coil and toroids from the ceiling of his lab, and mounted the driver on the wall. His magnifier system takes up zero floor space. [21k] Richard Hull's eight-point series quenched spark gap for magnifier work. [20k] These are Richard Hull's NWL custom-made impulse capacitors. Very high voltage ratings like these have will cost you really big bucks - but they work extremely well, and are very unlikely to ever fail.
[26k] The original rotary spark gap from the Nemesis Tesla coil.
[34k] Alex and Wild Bill connect transformers so they can be tested under working conditions.
[14k] Another view of Austin in his robot suit.
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