8 sept. 1973 - Inventions and discoveries

Description:

-The wireless transfer of electrical energy, using electromagnetic waves.
-The alternating current.
-Direct energy weapons (a "ray of death" based on electricity that was discarded by the US government as expensive)
-Radio.
-The theoretical principles of radar.
-Spark plugs for ignition engines.
-Radiogoniometer.
-The "Tesla coil", a resonant transformer.
-The remote control.
-The polyphase induction motor.
-The "Teslascope", a receiver of extraplanetary waves