Nikola Tesla Books
170 HIGH FREQUENCY APPARATUS and one inch in diameter, are given a series of saw cuts to a depth of three-eighth inch. Eight cuts will be required in each post to take the eight turns of primary strip. The cuts may be made with two blades of a hacksaw placed side by side to give the required thickness or, what is by far the better method, the cuts may be taken in a milling machine if one is available. The posts are located on the base-board and secured with short machine screws tapped into the fibre. Care should be taken to see that the screws do not pass into the posts beyond the bottom turn of the primary. The assembly of the parts is clearly shown in Fig. 21 and it is believed that no further comment is necessary other than to say that the bottom turn of the primary is connected with the ground stud, as shown in the diagram of connections. Installation of the Apparatus.-We have seen how the various instruments comprising the high frequency current generator are built in order that we may have available a steady supply of high potential current, oscillating at a frequency of approximately 100,000 cycles per second. It is this high potential, high frequency current that we shall employ in the electrification of our plot of ground, and the object of the present article is to point out how the various instruments of the outfit are connected and combined to produce the current. The entire outfit should be housed in a perfectly weather-tight shed. The construction of the building may be comparatively crude, if the precaution is taken to carefully seal all cracks and crevices, not only in the walls, but around the door as well. In rainy weather, or even when the humidity of the air is high, the inside of the shed should be kept dry and warm by means of a small oil stove. Dampness is positively fatal to the successful operation of
