. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . , and then allowing the hydrochloric-acid gas (generated in any suitable manner) toflow into the globe to replace such air. I thenre-exhaust the globe and repeat the operationof refilling and re-exhausting several times 35until the small residue which remains consistsalmost entirely of hydrochloric-acid gas. Thefinal exhaustion should be done by means ofa Spreugel pump, so that as little gas as possi-ble will remain in the globe ; or all the opera- 40tions of exhausting and re-exhausting mightbe done by means of the
. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . , and then allowing the hydrochloric-acid gas (generated in any suitable manner) toflow into the globe to replace such air. I thenre-exhaust the globe and repeat the operationof refilling and re-exhausting several times 35until the small residue which remains consistsalmost entirely of hydrochloric-acid gas. Thefinal exhaustion should be done by means ofa Spreugel pump, so that as little gas as possi-ble will remain in the globe ; or all the opera- 40tions of exhausting and re-exhausting mightbe done by means of the Sprengel pump,meansbeing connected with the pump for filling theglobe with the hydrochloric-acid gas. What I claim is— 45 An incandescing electric lamp whose resid-ual atmosphere consists almost entirely of hy-drochloric-acid gas, substantially as set forth. This specification signed and witnessed this14th day of October, 1882. THOS. A. EDISON. Witnesses: H. W. Seely,Richd. N. Dyer. (No Model.) T. A. EDISON. INCANDESCING ELECTRIC LAMP. No. 274,294. Patented Mar. 20,
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Keywords: ., boo, bookcentury1800, booksubjectinventions, booksubjecttelephone
