These spectacular display devices produce arcs and sparks quite unlike the damped spark gap driven Tesla coils. Operation does not require a noisy spark gap that produces copious amounts of RFI radio frequency interference but operates efficiently at the quarter wave frequency of the secondary coil.
http://www.amazing1.com/tesla.htm
This project discharges a 25,000 Volt continuous, unbroken arc across two electrodes and can be heard in an entire auditorium . It uses an electromagnet, an automotive ignition coil, a set of automotive ignition points, available at any auto parts store and can be wired up easily in a half an hour (no coil winding necessary).
http://primeline-america.com/science/
produces 18" sparks.
http://www.montagar.com/~patj/tes2.htm
Construction tips, including gaps, HAWG caps, Altair's MkII coil and pictures.
http://www.altair.org/tesla.htm
uses neon transformer and spark gap.
http://www.montagar.com/~patj/tes1.htm
Tesla Coils and the failure of lumped-element circuit theory. A very scholarly treatment of the subject.
http://www.ttr.com/corum/index.htm
How to build a pole pig, a primary, a secondary and a variac.
http://home5.inet.tele.dk/f-hammer/tesla/tesla.htm
Tesla Coil page, projects, theory, design and construction.
http://home.wtal.de/herbs_teslapage/index.html
Conventional Tesla coil, magnifier and vacuum tube projects. Efficiency theory, rotary spark gap phase shifter circuit and design information.
http://hometown.aol.com/futuret/page3.html
Construction of Medium sized Tesla coil. Mostly pictures.
http://www.geocities.com/MotorCity/Boulevard/8409/tesla.html