Here the picture shows Tesla lighting up wireless bulb. The huge pancake coil is at the background. Tesla is holding one bulb in his hand and a loop wire in another hand.
Figure 1 Nikola Tesla sending 500KV through his body to illuminate a vacuum lamp in a multiple exposure photograph [circa,1898]
Figure 2 Picture of Tesla demonstrating the wireless power transmission at Madison Square Garden. Same picture as Figure 1. Here you will see a transmitter at the background in addition of the pancake coil.
Figure The high tension current being passed through the body before it excites the lamps to incandesence. The loop is held over the resonating coil by Mr Clemens (Mark Twain). Tesla seems to be at the background. From the April 1895
Century Magazine.
Figure :Wireless energy transmission demonstration during Tesla's high frequency and potential lecture of 1891.
You can see two plate beside Tesla. Tesla said power can be transmitted through natural medium such as sea,lakes,earth and atmosphere. In atmosphere, if the breakdown voltage is exceeded the gas become ionized. In the picture, a high power ultraviolet beam might be used to form a vertical ionized channel in the air directly between the transmitter receiver station. The picture below shows the circuitry.
Figure : Tesla illuminating two exhausted tubes by means of a powerful, rapidly alternating electrostatic field created between two sheets of metal suspended from the ceiling on insulating cord.
The Tesla effect is the application of a type of electrical displacement, i.e., the passage of electrical energy through space and matter, other than and in addition to the development of a potential across a conductor. Tesla stated,
"Instead of depending on [electrodynamic] induction at a distance to light the tube [... the] ideal way of lighting a hall or room would [...] be to produce such a condition in it that an illuminating device could be moved and put anywhere, and that it is lighted, no matter where it is put and without being electrically connected to anything. I have been able to produce such a condition by creating in the room a powerful, rapidly alternating electrostatic field. For this purpose I suspend a sheet of metal a distance from the ceiling on insulating cords and connect it to one terminal of the induction coil, the other terminal being preferably connected to the ground. Or else I suspend two sheets as [...] each sheet being connected with one of the terminals of the coil, and their size being carefully determined. An exhausted tube may then be carried in the hand anywhere between the sheets or placed anywhere, even a certain distance beyond them; it remains always luminous."
and
“In some cases when small amounts of energy are required the high elevation of the terminals, and more particularly of the receiving-terminal D' may not be necessary, since, especially when the frequency of the currents is very high, a sufficient amount of energy may be collected at that terminal by electrostatic induction from the upper air strata, which are rendered conducting by the active terminal of the transmitter or through which the currents from the same are conveyed."
Tesla also mentioned that wire can be heated and melted but not to humans.
"I have produced electrical oscillations which were of such intensity that when circulating through my arms and chest they have melted wires which joined my hands, and still I felt no inconvenience. I have energized with such oscillations a loop of heavy copper wire so powerfully that masses of metal, and even objects of an electrical resistance specifically greater than that of human tissue brought close to or placed within the loop, were heated to a high temperature and melted, often with the violence of an explosion, and yet into this very space in which this terribly-destructive turmoil was going on I have repeatedly thrust my head without feeling anything or experiencing injurious after-effects. " from
Century Magazine, June 1900
