Nikola Tesla - Free-Energy Devices

80 INVENTIONS OF NIKOLA TESLA.by bolts D. Each plate is formed with four (more or less) longcores E, around which is a space to receive the coil and an equalnumber of short projectionsF to receive the coils of the resistancecircuit.The platesare generally annular in shape, having anopen space in the centre for receiving the armature G, which Mr.Tesla prefers to wind with closed coils. An alternating currentdivided between the two circuits is retarded as to its phases inthe circuit A to a mucli greater extent than in the circuit B. ByFIG. 65.FIG.reason of the relative sizes and disposition of the cores and coilsthe magnetic effect of the poles E and F upon the armature closelyapproximate.An important resultsecured by the construction shown hereis that these coils which are designed to have the higher selfinductionare almost completely surrounded by iron, and that theretardation is thus very materially increased.