Apparatus for electric lighting.

P. O. HEWITT. APPARATUS FOR ELECTRIC LIGHTING. APPLICATION FILED MAY 3, 1902. BENEWED APB. 16, 1908.

901,294. Patented Oct. 13,1903.

<img file="US901294A_D0001.tif" />

itweooeo

<img file="US901294A_D0002.tif" />

<img file="US901294A_D0003.tif" />

United States, and a’i i οα 4-Λ k *1 uuv BU lUCUDetl

I as to have its lays mmgle with those of the mercury lamp. ⁵ certain new and useful Improvements in Ar ηΟΡηττια Faw _· τ · ι .· _ _ 1

UNITED STATES PATENT OFFICE. XffSS «SSlON OF NEW?X^MENTS' ^T° APPARATUS FOB ELECTRIC UGHTIlfO.

No. 901,294. o -- .. ~ _Λ ,4 “ * “‘τ!**”*· *«·¹³· ”» it***'**·*·

To dll whom it may concern: r „„ j ,, , «“f LPetbr Cooper Hew- I bonas a car- 55 nr, a citizen of the United-States and a ^! to*¹ °·^{Γ other} sohd filament lamp connected resident of New York, in the county ofNew £ P^araUel therewith, but so located 5 York and State of New York, have invented ^{lt8 mye} ®^{ingle Wlth} those ^of the certain new and useful ImproVemmitsfo An- ^m“^cu^ ^lanT· / .

paratus for Electric Lighting of which tie na ^lnyention is illustrated in the accom- 60 following is a speeificatron ^ Paying drawings, in which

My invention relates to improvements in ^lgurV shows a mercury vapor lamp in 10 electnc lighting apparatus in which electric ί SpiT^iM?°^rdlnary incandescent lamp; .

energy is employed for producing St f fo nf™iui ^1Ut?⁸t^rates a mercury vapor lamp through the agency of vapors and gases ⁸ Janin ^an “dinary incandescent 65

Hn another applicationffiled by me inril Γⁿ?,^also,a diagram of a system of

5th, 1900, Serial Number 11,605 I have de ·^CIrCU·^ ^{h ma}y be employed in sen bed a form of vapor or eas electric kmn I withthe former. ' m which a good conducting path is formed ^g‘ ^a tube, 1, of glass is for currents of moderate potential and Tttwo electrodes, 2 and 5. 70 which is capable of reiniUf iX J ²¹⁸ here shown as consisting of _ a sohd .body which is conductive under oZ Proper, condition The electrode 5 consists . the m this instance of a bodv of mτ—a .

a mercury vapor lamp through the agency of In ftnoihziT __Z»1 1 v ® which is capable of regulating within’ itself 9o ± T^{ent flowing}> ^{80 thatA} * suited for ^{20 g}?neral use upon commercial circuits ( of the materials sometimes employed for the to iim^^{ttlng me<hu}m in the lamp referred ^vap?^r· ^The spectrum of mercury is deficient m red rays, and for some i« aX°bl^ “ «^b^d““ θ' rod n>J» witb^. VIm ^lnvention aims to combine ³⁰

For convenience of description, it will be assumed that a lamp is employed in which the mam portion of the light is produced by 35 mercury yapors and that it is desired to sum plement it with a spectrum having a sufficient abundance of red rays

The present application is’ a division of an zn X^h(i^atlOIi No 11,608, filed by me on t£ ° ^ΑρπΙ’ 19θθ, the prior application wSh^a&amp;

^aboYF described result is accomplished by combining or associating with the mercury vapor, a vapor or gas such, for in45 stance, as nitrogen, helium, or aigon, which also is to be acted upon by the efe ’ — -his instance of a body of mercury. LeadW^hTh?!⁰⁸’ ⁷i^a^d respectively, connect 75^;with the two electrodes through the walls of ^4.¾^38- x ^AdJ^a9®^nt to or in proper relation ’A¹ °.^rdinary incandescent ' ..am? κ ^{1 18} shown as provided with a bulb 4 which may be used as a cooling 80 and impurity containing chamber, or ma? be dispensed with under certain conditions V ¹⁸i?t^uaUy desirable that the chamber 4 should be out of the conducting vapor path.

^{a?llpS s}_T^{hown in Fi}S· ^{1 are} con- 85 nected in senes. In the operation of this ^c{^⁸⁸ of ^vapor lamps, it is sometimes desirable that a steadying resistance be connected in senes with the vapor lamps, and in such instances the incandescent lamp, connected 90 as m Fig. 1, well serves this purpose.

To render the gas or vapor lamps suitable tor general use upon commercial circuits, it is desirable that they should receive currents under the influence of moderate electronic- 95 tive forces and possess within themselves the capacity of self regulation with respect to the amount of current received. I have found /that lamps may be made which wifi conduct »ieu is oo pe acted upon, bv thp αΓλ^™ ------&lt;, ^{J MC} iu»ue wmcn win conduct rent-so as to produce red rays in addition tn j^Curront ^^ow potentials and within requisite 100 such other rays as trum, thereby supplying the deficiency oTthe ™^a^^er tp be self mercury spectrum ««nciency of the regulating and highly efficient. The general ^;

In the present application, I show and de- th^^^f’^¹¹® J⁸ tp thoroughly,cleanse scribe means for accomplishing t.h_o denirr-ri ^or receptacles by alkalies and 105 ·ι * _e x B11UW anCl Qft— reSt h^^eanS k^?r the desired result by combining with such a lampas the mercury vapor lamp an ordinary form of inproper acids, then exhaust them by passinc electric currents through them during the process of exhaustion. The lamp is fm-ther

901,294 such a condition on the part of the vapor column as to cause the current from the con- 45 ductors 24 and 25 to flow easily through the lamp and operate it.

Referring again to Fig. 2, a switch, 30, is introduced into the conductor 20. A switch 33 is also introduced into a conductor 35 50 running from the main conductor 24, and also containing a resistance, 34. lhe conductor 35 is connected beyond the switch to the conductor 20.

In still another application filed January 55 18 1908, Serial Number 411,384 as a division of the same parent application above referred to, claims are made upon other features of the system herein disclosed.