USD13940S - Design for incandescing electric lamp - Google Patents

Description

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DESIGN.

A: EDISON. INOANDESOING ELECTRIC LAMP. No. 13.940. Patented May 29,1883.

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b UNITED STATES PATENT OFFICE.

THOMAS A. EDISON, ()l MENLO PARK, NE\V J E lSEY, ASSlGNOll TO THE EDISON ELEUTIHU LIGHT COMPANY, OF NEW' YORK, Y.

DESIGN FOR INCAND ESCING ELECTRIC LAMP.

SPECIFICATION forming part of Design No. 13,940, dated May 29, 1883. Application liled March Ill, 1681!, Term of patent H years.

To all whom it may concern:

Be it known that I, THOMAS A. EDISON, of Menlo Park, in the county of Middlesex and State of New Jersey, have invented a new and original llesign for lncandescing Electric Lamps, (Case No. 54-5,) of which the following i is a specification.

The object 1 have in view in producing this design is to imitate in the carbon burner orineandescing conductor of an electric lamp the form of the flame of an ordinary gasietthat is,narrowatitslowerportion,flaringoutwardly 1 toward the top, and depressed in the middle;

and the leading feature of my design consists in an incandescing conductor formed in this shape. I prefer to employ also in connection i with this conductor an inclosing-globe of substantially similar form.

My invention is illustrated in the annexed drawing, which represents in elevation an incandesciug electric lamp formed according to my design.

In this lamp two carbon filaments, A and A, are used, connected together electrically at a. Each filament is looped, as shown, and the two are bent out so as to diverge from each other and form the shape shown. The glass globe B, which ineloses this conductor, is blown in i a shape whose section is similar in shape to l said conductor, it being narrow at the bottom where the supporting-tube Ii is sealed to it, and i flaring outwardly to near the top. A projection,e, is formed at the top of the globe. The I burner thus formed, when rendered incandes- 1 cent by the electric current, presents an out- 1 line similar to that ot'a gas-flame. What 1 claim isi 1. The incandescingcomluetoroi aneleetrie lamp, shaped substantially as shown and de scribed.

2. in an electric lamp, the incandescingcoir l ductor, shaped substantially as shown, in cont I bination with an inclosing-glohe substantially of the form shown and described.

This specification signed and witnessed this 13th day of February, 1883.

THOS. A. EDISON. Witnesses i H. W. SEELY,

EDWARD H. Pmr'r.

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