図1と図2に示すとおり、ニコラ・テスラが何故に放電の近傍に磁石を置いたのか? 理由がわかるような気がします。 つまり、磁石付近において、放電(電流)の方向と直交する力が放電に働いているということです。プラズマ放電による空気の高熱化による上昇気流の影響はありますでしょうけれど、スラスト方向に力が働いています。これはマイケル・ファラデーが発見した「単極誘導」の現象です。 動画1のコメント欄に作者自身が「The reason the arc rotates is because there is a Lorentz force acting on it. The arc is essentially functioning the same as the wire in a homopolar motor like this:」とコメントしています。
One of the principal obstacles to the rapid progress of your science is that your scientists have not yet fully grasped the simple unity of matter and energy. One of your greatest thinkers, a professor, Albert Einstein, published, many years ago, the mathematical formula which described quantitatively the equivalence of matter and energy. This formula, while perfectly correct mathematically, leads to the incorrect conclusion, that matter is convertible into energy and vice versa. The truth is that matter and energy are merely different aspects of the same entity.
The large drum like structure just above the central bulkhead is the differential accumulator. It is essentially a storage battery which is capable of being charged from any of a number of natural energy differentials which may be available. By the word `charged,’ I merely mean that a potential difference is created between two poles of the accumulator.