Nikola Tesla Books
128 HIGH FREQUENCY APPARATUS Fig. 3.-Oil-immersed oscillation transformer for X-Ray work of course, to be wound in the same direction as one coil is to be a continuation of the other when they are placed end to end. The two secondaries are secured to the central piece of wood which is fastened to the cover of the case that contains the transformer. The outside ends of the secondary winding are connected with rods leading to the discharge balls of the coil while the inside ends are, of course, connected together, a wire passing through the supporting board for this purpose. The primary is composed of 8 turns of edgewise wound copper strip 7½ in. inside diameter. The helix is divided in the center in order that 4 turns may be placed on either side of the wooden piece upon which the secondary cylinders are mounted. The primary turns are mounted upon slotted fibre supports in the usual manner. A tap consist
