The U.S. Patents of Nikola Tesla

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105 9. The combination, arc-lamp, a main and shunt magnet, armature-lever 40 draw the arc, clamp, and armature to act upon the clamp, clamping-pole and a releasing-pole upon the respective cores, the cores, poles, armatui’e-lever, and clamping- armature forminga compound electro-magnet, 45 substantially set forth. The combination, with the carbon-hold­ ing rod and clamp for the same, ar­ mature upon the clamp, shunt-magnet the pole which acts release the clamp, and a main magnet with two-part helix, one por- o tion being the main circuit and the other portion ashunt cut-out circuit, the clamp­ ing armature acting close said cut-out cir­ cuit when the arc becomes too long and to break the shunt-circuitwhen the carbonscome 115 together, substantially set forth. 5. Witnesses: Geo. Pinckney, William:G. For this purpose proportion the re­ sistance the part and the number the convolutions the wire upon the main mag- io net that when the carbons come contact a sufficientamountofcurrentisdiverted through the carbons and the part destroy neu­ tralize the magnetism the compound mag­ net. also obvious say 35 that the magnets and armatures may any desired shape. electric-arc lamp, the combination, with two upright magnets the main and shunt circuits, respectively, having curved pole-pieces one end and converging pole- pieces the other end, flat Z-shaped 80 armature lever between the curved pole- pieces and clamping-armature between the convergent pole-pieces, substantially de­ scribed. The combination, with the carbon-hold­ ers electric lamp, clamp around the rod the upper-carbon holder, the clamp- 60 iug-armature connected with said clamp, the armature-lever and connection from the same to the clamp, the main and shunt magnets, and the respective poles the same actupon the clamping-armature and armature-lever, respectively, substantially set forth. electric-arc lamp, the combination, with the carbon-holder and magnets, the armatures and link e', clamp and lever f, and the spring s', for the purpose set forth. NIKOLA TESLA. The combination, electric-are lamp, 85 of electro magnet the main circuit and an electro-magnet the shunt -circuit, an armature under the influence the poles of the respective magnets, and circuit-connec­ tions controlled such armature cut out 90 or shunt the lamp, substantially specified, whereby the branch circuit closed the magnetism the shunt-magnet, and then kept closed induced magnetism from the main magnet, substantially set forth. 65 4. 7. It will seen that the cut-out may modi­ fied without departing from . The combination, with the carbon-holder and rod and the main and shunt magnets, of a feeding-clamp, armature for the same, clamping and releasing poles upon the cores of the respective magnets, and circuit-connec- 100 tions through the clamping-armature, substan­ tially specified, for shunting the current when the electric arc between the carbons be­ comes abnormally long, substantially set forth. . 2.335,787 3! against the shunt-magnet pole n'. 75 6. I claim invention— 1. The combination, electric arc lamp, of carbon-holder and its rod, clamp for such carbon-holder, clamping-armature con­ nected the clamp, compound electro-mag- 50 net controlling the action the clamping-ar­ mature, and electric-circuit connections, sub­ stantially set forth, for lessening the mag netism the compound magnet when the arc between the carbons lengthens and augment- 55 ing the magnetism the same when the arc is shortened, substantially described. The lamp is thus cut out long the carbons are sepa­ rated.the spirit my 30 invention, long the shunt-magnet closes a circuit including wire upon the main mag­ net and continues keep the contact closed, being magnetized magnetic induction from the main magnet. Mott. Then the armature having slight 15 tendency approach the clamping-pole m', comes out contact with the releasing pole As soon this happens, the current through the part interrupted, and the whole cur­ rent passes through the part The magnet 2c now strongly magnetized, the armature g attracted, and the rod clamped. In this way the lamp cuts itself out automatic- 25 ally when the arc gets long, and reinserts itself automatically the circuit the car­ bons drop together. 95 8. the same time the armature-lever pulled down out its normal position and the arc started. electric-arc lamp, cut-out con­ sisting main magnet, armature, aud a shunt-magnet having insulated pole-piece, and the cut-out circuit-connections through the pole-piece and armature, substantially 70 set forth. 1885. The cut-out may used this form without any further improvement; but pre- 5 fer arrange that the rod drops and the carbons come contact the arc started again. 3. Signed this 11th day July, D