"Now, for the first time the secrets of Nikola Tesla's Earthquake Machine are available, and now with new blueprints to build your own working model. Although this book discusses in detail Nikola Tesla's 1894 "Earthquake Oscillator" this book is also about the new technology of sonic vibrations which produce a resonance effect that can be used to cause earthquakes. Discussed in this large format book are Tesla Oscillators, vibration physics, Amplitude Modulated Additive Synthesis, Tele-Geo-dynamics, Solar Heat Pump apparatus, vortex tube coolers, the Serogodsky Motor, more. Plenty of technical diagrams. Be the first on your block to have a Tesla Earthquake Machine! 175 pages." (Title: "Nikola Tesla's Earthquake Machine with Tesla's Original Patents"), by Dale Pond and Walter Baumgartner. 9x11 Photos, Illustrations & Diagrams. Bibliography & Index. $16.95.
http://www.adventuresunlimited.co.nz/TeslaTechnology.html Not trying to sell the book, just raising the question of overall plausibility for physical application of energetics principles by technicians unaided by state sponsorship, and implied corollaries.
Interesting. The free power thing mentioned at one of links I posted earlier sounded pretty neat too.