[NM017AAG1], Letter from Thomas Alva Edison to Henry W Seely, November 1st, 1882


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[NM017AAG1], Letter from Thomas Alva Edison to Henry W Seely, November 1st, 1882

Editor's Notes

"Seely: write patent on method of equalizing the electromagnetic force of machines driven by Gas Engines." Several pages of analysis & explanatory text follow, with sketches. Problem is to compensate for irregular speed produced by explosions in cylinder: I place upon the rotating portion of the enging an eccentric or cam, which cam may be set in any position a strap over the cam carries a rod or arm which serves to close an electric circuit. The cam is so set that at the moment of explosion the current is closed & a number of incandescent lamps are thrown across multiple arc in a circuit whereon there are other lights. The effect of adding these several lights or wire resistances equal thereto is to check the rise in emf due to acceleration due to explosion & thus render the lights constant notwithstanding the engine runs unequally. If an Otto gas engine is used the gas and air should always have the same proportion….in this m anner an explosion can be made to take place at every revolution and the compensation due to throwing on lamps or resistance acts perfectly. Outlines broad claims. [See US Pat 276,232] {xxx Consider for selection}





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Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University
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