The U.S. Patents of Nikola Tesla

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8. The combination, with rotating field- magnet core having two opposing and annu­ lar polar faces with radial grooves serra- 70 tions therein systematically disposed, that the highest parts prominences one face lie opposite those the other, station­ ary conductor with radial convolutions and mounted between the polar faces, set-forth. Witnesses: Robt. 7. The combination, with the annular con­ ducting-plate slotted form connected se- 20 ries radial conductors, sectional support­ ing-frame secured and insulated from the outer edge the slotted plate, sectional ring secured and insulated from the inner edge said plate, hollow energizing-coil 25 contained said ring, and field-core com­ posed oftwoparts bolted together and recessed to inclose the energizing-coil, said cores being mounted rotating shaft, set forth. 2. . The combination, with opposing field- 60 magnet poles formed with projections ser­ rations their faces, the highest parts or prominences one face being opposite to those the other, conductor the convo­ lutions which are adapted pass right 65 angles through the magnetic lines between the opposing prominences, set forth. 75 NIKOLA TESLA. The combination, with two annular po- 30 lar faces opposite magnetic polarity and foimed with opposite points, projections, or serrations, conductor turned back upon itself substantially radial convolutions and mounted theannular field, wdiereby rota- 35 tion the field said conductor will develop therein alternating current, set forth. magneto-electric machine, the com­ bination sectional frame, field-magnet core composed two connected parts, rotat­ ing shaft w'hich said core mounted, 50 conductor which currents are in­ duced, the convolutions which are radially disposed, between the polar faces the field- core and secured and supported the frame, and energizing-coil for the field- 55 core supported the induced-current coil and contained annular recess formed by grooves the faces the tw'o sections of the field-core. The combination, with connected se­ ries radial conductors forming annular coil, ofa stationary two-part supporting-frame to clamped and insulated from the outer ends said conductors, ring formed twro parts clamped the inner ends the same, an energizing-coil contained said ring, and a field-core made two parts and inclosing 15 said energizing-coil and presenting annular polar faces the series radial conductors, as described. 3.447,921 8 ors passing between the strongest parts of the field, the points where the two poles most nearly approach, the adjacent inter­ mediate conductors will pass through the 5 weakest parts the field, the points where the two poles are most remote, set forth. 4. 6. Gaylord, Parker Page. The combination, with polar face of given polarity formed with grooves serra­ tions, polar face opposite polarity with 40 corresponding grooves serrations, the two polar faces being placed with their grooves opposite each other, and conductor coil mounted between said faces with the capa­ bility movement across the lines force in direction right angles that the 45 grooves serrations, set forth. 5