[N145027], Technical Note, Thomas Alva Edison, February 3rd, 1883


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[N145027], Technical Note, Thomas Alva Edison, February 3rd, 1883

Editor's Notes

{HIGHLY SELECTABLE multi-fiber filaments and eliminating O from globe}"Twisted continuous fibre Lamp or rather Compound filiment lamp. about 30 made & exhausted so far. Those having greatest number fibres best in fact 8 fibre filiments stand while the clamps melt from arcing= filiment OK= Ends copper plated & put in platinum Clamps. The resistsance is such that one gave 10 candle while a 95 Volt Lamp only came to yellow most of them stand with 185 Volts." "We find that the principle of making a filiment for the Lamp Composed so that every seperate fibre is seperately expansible is correct and that this kind of a filiment can be made even & cheap" "We have made a great number of experiments on low vacuum in connection with the compound filaments. We exhaust the lamp to 27 inches & then seal off & absorb Oxygen by heating iron spiral wire coated with finely divided iron. The oxygen oxizes the finely divided iron.' "we have not succeeded in getting rid of all the Oxygen we are now completing a device for aspirating or moving the air in the lamp & spiral wire tube as to get up a circulation & prevent all the air to have access to the [iron?] wire." Then sketch of a pump and lamp with means to absorb oxygen, by oscillating mercury to circulate air to dryer.



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