It is a resonate transformer which gives the short-range wireless power transmission through the mutual induction phenomena, coil consists of primary 600 turns & secondary 6 turns and a high switching frequency MOSFET circuit for generating a strong magnetic field through the change of flux. The supply source is given with dc 9-12 volt which passes through a high-frequency MOSFET circuit and works on the principle of Faraday's law of magnetic induction, This coil gives high voltage with a high field at the output which is enough to glow a fluorescent bulb Wirelessly when we bring the bulb closer to the coil and even if the bulbs are fused they will glow with the same intensity as they normally do and can be see in the below video because of the high magnetic field which links with the filament, excite the electrons and make it glow.
Testing With Fluorescent Bulbs
High voltage sparking from Tesla Coil
DIY Winding Machine
The most difficult part is the proper winding on the tube, here I've done from my own winding machine by attaching a gearbox motor to the winding pipe with a potentiometer in series with the battery, and using a potentiometer we can also control the speed of the motor and can wind easily. 
nice project keep it up!!
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