[NM020AAY], Technical Note, Thomas Alva Edison, July 7th, 1886


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[NM020AAY], Technical Note, Thomas Alva Edison, July 7th, 1886

Editor's Notes

Object is to get rid of the water vapor fig one has a contraction C to seal lamp off at pump A is tube filled with glass coated with phosphoric anhydride or other water absorbing agent d is a contraction drawn to a point & sealed E is two or 3 turns of iron wire hung on the hook. The Lamp being sealed is first put into an iron chamber & brought up to 600 to 800 degs fahr The aquous vapor being absorbed by the phosphoric acid in fact combines with it & it cannot again be driven off by heat. The bulb is kept at this temperature for an hour or two it being glass sealed no atmosphere can enter The steam is then passed through a section of rubber tube coated with Vasalene & put in the cup G of the pump. A magnet F is then brought upt to G is the attraction for the iron around the hook E is sufficient to break it off & the pump is started. The phosphoric absorbs the water entirely an as the diffusio of aquous vapor is slow none again enters from the pump as the lamp is heated by a chimney & Lamp while being exhausted. Fig 2 shews a method of decomposing the water by powdered clear iron in B. The Lamp is put in a chamber & heated to 6 or 800 deg fahr while the steam extends downward or outward through the chamber is heated to a dull read The iron combines with any free oxygen as well as decomposes the water vapor setting Hydrogen free. The Sealed hook E is broken off by magnet. Fig 3 shows an iron spiral which acts the same as Fig 2 (except the spiral is kept red hot while the lamp is in the heating chamber by an electric current--" figures follow




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