US500078A - Incandescent electric lamp - Google Patents

Description

(No Model.)

W. B. NICKERSON.

INGANDESGENT ELECTRIC LAMP.

No. 500,078. Patented June 20, 1893.

UNITED STATES PATENT OFFICE.

IVILLIAM EMERY NICKERSON, OF CAMBRIDGE, MASSACHUSETTS.

INCANDESCENT ELECTRIC LAMP.

SPECIFICATION forming part of Letters Patent No. 500,078, dated June 20, 1893. Application filed April 5, 1893. Serial No. 469,188- (No model.)

To all whom it may concern.-

' Be it known that I, WILLIAM EMEEY NICK- ERsoN, of Cambridge, in the county of Middlesexand State of Massachusetts, have invented a new and useful Improvement in In candescent Electric Lamps, of which the following, taken in connection with the accom panying drawing, is a specification.

My invention relates to incandescent electric lamps of that class in which the neck of the lamp globe is closed and the leading-in wires supported by a cement plug.

It consists of a device by which the heat from the incandescent filament is prevented from aifecting the cement plug by which the lamp globe is made air tight.

In the accompanying drawing I represents the glass globe of an incandescent electric lamp, J the filament attached atjjto theleadi'ng-in wires K K. g

L is a disk of mica or other suitable substance resting upon a shoulder Zformed in the neck of the lamp globe, and serving to support the fusible cement plug M, and the leading-in wires K K.

N is a disk smaller but similar to L and rests upon the shoulder It also formed in the neck of the lamp globe. The space between the disk II and the disk N is occupied by the ing-in wires K K, disk II, cement plug M, the

disk N, and the filling of sand 0, substantially as and for the purpose set forth.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, on this 3d day of April, A. D. 1893.

WVILLIAM EMERY NICKERSON.

lVitnesses:

FRANK G. PARKER, FRANK G. HATTIE.

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