. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . filament, of means preventing the fila-ment from leaving the groove, substantially asset forth. 5. In a mold for carbonizing filaments, thecombination, with the plate for holding the 70filament, of the inclosing - chamber and thebridge attached to the latter for securing the jends of said filament, substantially as set forth, f 6. A flat shallow mold for carbonizing fila- 1ments, -provided with means for holding such 75filaments under strain and permitting contrac-tion during carbonization, in combination with a cov
. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . filament, of means preventing the fila-ment from leaving the groove, substantially asset forth. 5. In a mold for carbonizing filaments, thecombination, with the plate for holding the 70filament, of the inclosing - chamber and thebridge attached to the latter for securing the jends of said filament, substantially as set forth, f 6. A flat shallow mold for carbonizing fila- 1ments, -provided with means for holding such 75filaments under strain and permitting contrac-tion during carbonization, in combination with a cover constructed to exclude air, substan- 1tially as set forth. 7. A flat shallow mold for carbonizing fila- 80ments, provided with means for holding suchfilaments under strain and permitting contrac-tion during carbonization,and having an edge Igroove, in combination with a cover provided Iwith a corresponding rib, substantially as set 85forth. This specification signed and witnessed this j17th day of February, 1883. THOS. A. EDISOX. Witnesses: II. W. Seelt,Edavaed H. WITNESSES: ^~/~^ INVENTOR: ATTORNEY S, Photo-Lithographer. Washington, D. United States Patent Office. THOMAS A. EDISON, OF MENLO PARK, NEW JERSEY, ASSIGNOR TO THEEDISON ELECTRIC LIGHT COMPANY, OP NEW YORK, N. Y. DYNAMO OR MAGNETO ELECTRIC MACHINE. SPECIFICATION forming part of Letters Patent Wo. 287,523, dated October 30, 1883. Application filed September 13, 1882. (Xo 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 nseful Improvement in Dynamo or MagnetoElectric Machines, (Case No. 436;) and I dohereby declare that the following is a full andexact description of the same, reference being-had to the accompanying drawing, and to the io letters of reference marked thereon. The object I have in view is to produce amore efficient construction of the field-of forceelectro-magnet of dynamo or magne
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