US859891A - Arc-light electrode. - Google Patents

Description

No. 859,891. ?ATEBITED JULY 9, m R. Hi 3mm. Am; mam ELEGTRGDE. APPLIUATIOYI FILED HAY 29. 1905. BEHEWED 5 11113 15, 19(57- Con Z; a/n

Zircon/um Carbide 0 pi wfi i W/Lnesse gm aim/Q12.

UNITED "STATES PATENT .onrron.

sensor 11. READ, or SCHENECTADY, NEW YORKIASSIIGNOR T0 GENERAL ELEc'rmc ooumsr, A CORPORATION or NEW YORK.

zinc-LIGHT ELECTRODE.

Specification of-Lettsrs Patent.

Patented July 9,

-. Original application flied May is, 1901, Serial so. some Divided and this application he Kay 29. icon. Harland June is, iio'z.

' Serial No. 319,113. Y

tain new and useful Improvements in Arc-Light Elec:

trodes, of which the following is a specification.

This invention relates to are lighting, the object being to improve the quality oithe light and permit the maintenance of a longer are with currents of moderate potential and amperage.

lamps formed of or containing a considerable proportion of the conducting carbids permit a longer are to be drawn foi the same potential and current than corresponding electrodes oi carbon, and produce a smoother action at the arcfthe-tendency oi the tips at the are terminals being to fuse bei'orei vaporization, thus conducing toward a quiet action free-from hissing or decrepitation, and much more steady than a carbon are; The color of the arc varies with the base of, the carbid, for example, an arc containing carbid oi calcium has a rich golden color of great luminosity, while one formed ofor containing aluminium carhid hams much whiter appearance, the spectrum varying with the nature of the earbid.

I I prefer to employ carbids which are unaffected 'by moisture and therefore do not deteriorate in service when exposed to the atmosphere.

In my original application, Serial Number 60,813, of which the present application is a division, I describe variousparbids which might be employed. My present application is based on the use of zirconium carbid or a compound containing the some, as an are light electrode material. .It yields eminently satisfactory results in are lighting, giving a light of extraordinary eiiiciency, the are obtained being flaming or luminous and of a very good white color. It may be employed pure or mixed with a carbonizable .binder molded and baked- It may also be used for a cored carbon. in preparing the electrodes of this material, the zirconium carbid may be finely pulverized and molded in sticks of the desired size by mixing it with a carbonimblo binder, such as cane sugar or wheat flour moistened witlicmil lar or cvclhcold water. Aiterdry- I have discovered that conducting electrodes for are ing and baking at a bright red heat its'structure may be rendered more compact and dense by filling the pores with carbon by any approved procem, such for example to a red heat in a hydrocarbon vapor.

I find that snare lamp provided with electrodes 0! and renders the aremors tenacious than a carbon arc. The electrodes-are inherently slow burning even inthe open air. The oxid or other vapors developed inborning may if desired be trapped in an inclosing globe, and the lamp may beprovided with a wiper periodically operated to remove the deposit from the walls of the globe, or a draft niay be provided through the inclosing globe to prevent a deposit. When burning in an auiomatic lamp it is desirable to of oxid formed at the electrode terminal is a poor conductor. Various methods may be employed to start theflow of current to strike the are. The admixture 'culty. X V

In the accompanying drawings, Figures 1 and 2 illus trate elevations of are light pencils of different sizes cored electrodc.

The electrodes shown in Figs. 1 and 2 respectively are designed for lamp. carrying diii'erenteurrents. In the type shown in Fig. 3 a hollow carbon pencil 3 is filled with a core of conducting carbid compound,'as above described. 4 v

This application is a division of my pending application Serial Number 60,813, filed May 18, 1901.

ll'hat'I claim as new, and desire to secure by Letters Patent of the United States, is,- a

with a suitable binding material.

27th day 0! May, 1905.

nonnn'r nfnmn.

Witnesses:

as saturating with sugar and again firing, or by raising formed according to my invention; Fig. 3 shows a An iireeiectrode consisting of zirconium carbld admixed in witness whereof. i have hereunto set my hand this so such material gives a more eificient light than a carbon. arc. The-fusion oi the carbid conduces to steadiness 3 provide special means for starting the are as the deposit of the carbid with the carbon tends to reduce this diili? I

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