Nikola Tesla Books
INDUCTION COIL OUTFITS 65 No. 4, is wound in the same way. The reason for this will be seen when the assembly starts. Assembly. The frame of the coil is well shown in Fig. 9. The ends of the core fit into holes in upright pieces of wood which form the supports for the entire coil. The secondary sections are arranged upon the micanite tube in the order of their numbers, starting from left to right. If the winding has been done as described, the first outside lead will go to the binding post, S¹, the inside lead of section 1 to that of section 2; the outside lead of section 2 to the outside lead of section 3; the inside of 3 to the inside of 4; and the outside of 4 to the remaining binding post. The two primary leads are carried to one binding post in the base and to one side of the interrupter respectively. Interrupter and Condenser.-An independent interrupter is much to be preferred for use in connection with this coil. The interrupter may be of the mercury-turbine type, the vibrating contact type, or the electrolytic. The last mentioned style of break will give the greatest results if the interrupter is properly designed and built; if the worker does not care to go to the trouble of making this rather delicate device, the construction of which involves some rather good glass-working, he may purchase the interrupter outright for $2.25. This price would scarcely cover the cost of the materials and the workmanship on the break if the amateur worker were to build one. The vibrating type of break will give good results if its contacts are of generous proportions and the component parts of the interrupter properly designed. The data given herewith specifies the use of hard silver contacts in. in diameter rather than platinum ones of a much smaller size. Before we proceed with the description of the vibrating interrupter, however, a brief mention may be made of the mercury-turbine break, which is in many ways the ideal type.
