Wikiepedia --Wireless power transmisssion:
After 1890, Tesla experimented with transmitting power by inductive and capacitive coupling using high AC voltages generated with his Tesla coil.
[100] He attempted to develop a wireless lighting system based on
near-field inductive and capacitive coupling and conducted a series of public demonstrations where he lit
Geissler tubes and even incandescent light bulbs from across a stage.
[101] He would spend most of the decade working on variations of this new form of lighting with the help of various investors but none of the ventures succeeded in making a commercial product out of his findings.
[102]\\
Death Ray:
so-called 'death rays.' Rays are not applicable because they cannot be produced in requisite quantities and diminish rapidly in intensity with distance. All the energy of New York City (approximately two million horsepower) transformed into rays and projected twenty miles, could not kill a human being, because, according to a well known law of physics, it would disperse to such an extent as to be ineffectual. My apparatus projects particles ..."
[5]