. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . ab-sorbent of gases, then connecting the two whilehot, aod finally heating the incandescing con-ductor by the passage of an electric currenttherethrough previous tosealiugoff the lamp, 20 substantially as set forth. 3. In apparatus for producing vacua, thecombination, with a chamber containing a gas-absorbing material, of means connected there-with for ascertaining the degree of exhaustion,substantially as set forth. 25 4. The process of producing a high vacuum,consisting in displacing the air in the chamberto be ex
. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . ab-sorbent of gases, then connecting the two whilehot, aod finally heating the incandescing con-ductor by the passage of an electric currenttherethrough previous tosealiugoff the lamp, 20 substantially as set forth. 3. In apparatus for producing vacua, thecombination, with a chamber containing a gas-absorbing material, of means connected there-with for ascertaining the degree of exhaustion,substantially as set forth. 25 4. The process of producing a high vacuum,consisting in displacing the air in the chamberto be exhausted by another gas, (such as hydro-chloric-acid gas, hydrobromic-acid gas, or am-monia-gas,) and then connecting such cham- 30ber with another chamber containing a sub-stance which readily absorbs such gas, sub-stantially as set forth. This specification signed and witnessed this28th day of February, 1882. THOMAS A. EDISON. Witnesses: H. W. Seely,Thomas Johnston. 1 (No Model.) T. A. EDISON. MANUFACTURE OF INCANDESCING ELECTRIC LAMPS. No. 278,417. Patented May 29,. United States Patent Office. THOMAS A. EDISON, OF MENLO PARK, NEW JERSEY, ASSIGNOR TO THEEDISON ELECTRIC LIGHT COMPANY, OF NEW YORK, N. Y. MANUFACTURE OF INCANDESCING ELECTRIC LAMPS. SPECIFICATION forming part of Letters Patent No. £73,417, dated May 29, 1883. Application filed January 22, 1883. (Mo model.) To all whom it may concern : Be it known that I, Thomas A. Edison, ofMenlo Park, in the county of Middlesex andState of New Jersey, have invented a new and5 useful Improvement in the Manufacture of In-candescing Electric Lamps, (Case No. 536,) ofwhich the following is a specification. In my application (Serial ,526)is described an incandescing electric lamp io whose inclosing-globe contains nitrogen at apressure which prevents electrical carryingfrom the carbon incandescing conductor. The object of my present iuveutiou is to pro-vide a simple, economical, and efficient method 15 of introduci
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