[N322AAB], Technical Note, John F Ott, Thomas Alva Edison, August 10th, 1886
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Title
[N322AAB], Technical Note, John F Ott, Thomas Alva Edison, August 10th, 1886
Editor's Notes
"Made 6 lamps with Telephone lampblack which is good conductor an extra platina wire passes in lamp & lays inside lamp down where it is sealed-- The Lampblack incline it is heated by Kerosene Lamp to drive off gases & decompose Hydrocarbon & eliminate water-- after Lamp sealed off the lampblack is shaken down to bottom of globe where it comes in contact with the extra platina wire Lamp is then set up at 80 CP the extra platina wire is connected to positive & some lamp are connected to negative wire outside lamp tests show that when wire connected to positive life is longer-- it may be that when connected to negative it has a bad effect on filiment & the reason why lamps last longer on P is there is no effect. I have also made several lamps with carbonized anthracite coal powder-- This gives off scarcely any gas & doesn’t dirty the lamp bulb-- The P wire to Carbon powder gives best results. I notice that the blackening instead of stopping short at clamps extends clear down below clamps to surface of the anthracite-- I am trying putting a coating of glacial phos acid on inside globe & connecting it to the wire that is near the seal so the potential of the glove will be the same as the clamp-- 159 Unwashed undried powdered anthracite in side tube extra wire leading into inside part Anthracite heated with Kerosene lamp worked regular way reversed current, worked anthracite in bottom of globe after sealing off lamp then sealed side tube off fil shiny clamp & globe clean-- 160 same as 159 fil shiny globe & clamp clean 161 same as 159 fil shiny globe & clamp clean 162 same as 159 except there is 3 times as much anthracite, so it will nearly touch wires as they come into vacuum-- fil shiny clamp & globe clean-- 163 unwashed & undried powdered glacial phosphate acid put in globe little water put in-- put on drier & dried hot, then allowed Coal-- put on pump worked regular way-- clamps & globe clean fil shiny-- 164 unwashed powdered glacial phosphorous acid & little water in globe to make conducting surface extra wire into vacuum down at seal-- put on drier & heated, cooled & then put on pump heated with Kerosene-- current revised-- fil shiny globe little whitish clamps clean-- to have its extra wire connected opposite to 163-- peculiarity is that inside part little yellow also globe [near?] clamps-- 165 unwashed undried 1 milligramme Napthalin-- exhausted regular reversed current-- clamps clean globe clean fil shiny run fil up higher than usualy by running peg down quickly-- 166 same as 165-- appearance same-- (drawings pumps next two pages) 167 Dried on drier-- 2 milligrammes Napthalin in globe-- Let it burn at about 16@20 candles as it seems to deposit best at lower incandescence on bringing it up high the globe was very much whitened there seems to be a chemical reaction taking place-- fil very shiny by deposit both clamps althout I didn't reverse-- 168 Dried on drier 2 milligrammes terchloride carbon got vac then quickly run to about 16 CP then let it stay deposit goot at this CP & lots gas comes off I still let it burn notwithstanding the great amount gas-- don't think it chlorine as it didn’t' dirty tube but very little globe kept perfectly clean of blue, a small amount of whitening took place both sides near clamps perhaps Chloride Copper-- ran it up high diddn't whiten any more but when very high blue came in-- reversed-- clamps clean globe clean & fil very shiny--"
Author
Date
1886-08-10
Type
Folder/Volume ID
N322-F
Microfilm ID
43:456
Document ID
N322AAB
Publisher
Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University