[N029031], Patent Application, Thomas Alva Edison, May 1st, 1879


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[N029031], Patent Application, Thomas Alva Edison, May 1st, 1879

Editor's Notes

Specification for new Brit Pat re what happens when heated based on Jan-Feb expts, cause of rupturing is expansion of gases in metal loss of weight and apparent volatilization is due entirely tot he attrition of the air molecules against the highly heated surface, conducted expts to obviate and had succeeded by following method of raising temperature at intervals of 10-15 minutes while exhausting bulb until it reaches incandescence; also re coating with oxide of magnesium; also use of chemically pure iron and nickel, carbon sticks also made more homogenous and hard by this method as well as mixtures of finely divided conducting and nonconducting materials; multiple arc "It is essential to reverse the present universal practice of having lamps which have but one or two ohms resistance and construct lamps which shall have when giving the proper light of several hundred homs I have ascertained by experiemnt that the loss of energy is in proportion to the extent of the radiating surface & independent of the resistance of the conductor; in practice 200-300 ohm lamps sufficient; burner lamp with bobbin of infusible oxide, drawings, motor regulator; need to and methods for preventing sparking at generator; meters; generators



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