In the 1930s inventor Nikola Tesla announced to the world two astonishing new inventions. The first was a particle-beam projector that Tesla intended to be used as an instrument of national defense. He called his system "teleforce." One year later, on July 10, 1935, Tesla claimed a method to transmit mechanical energy with minimal loss over any terrestrial distance, allowing for a new means of communication and a technique for the location of subterranean mineral deposits. He dubbed it the "art of telegeodynamics." These two important papers, hidden for more than 60 years, are presented for the first time in NIKOLA TESLA'S TELEFORCE AND TELEGEODYNAMICS PROPOSALS. The principles behind teleforce the particle-beam weapon, and telegeodynamics the mechanical earth-resonance concept for seismic exploration, are fully addressed. In addition to copies of the original documents, typed on Tesla's official stationery, this work also includes two Reader's Aid sections that guide the reader through the more technical aspects of each paper. The papers are followed by Commentary sections which provide historical background and functional explanations of the two devices. Significant newspaper articles and headline accounts are provided to document the first mention of these proposals. A large Appendix provides a wealth of related material and background information, followed by a Bibliography section and Index.