The first ARC lamps were developed in’09 by Sir Humphrey Davy. These lamps were carbonic arch lamps functioning with one carbon baguettes fixed at each of the two polls of a battery and creating through their touch a white incandescent light. If these baguettes were separated and put at a distance of 10 cm they would create a luminous strong white light arch. These principal is what stays at the base of the projector lamps present nowadays.