US1764148A - Mercury vapor lamp and apparatus - Google Patents

Description

June 17, 1930. L. J. BUTTOLPH 1,764,148

MERCURY VAPOR LAMP AND APPARATUS Original Filed Sept. 27. 1923 2 SheetsFSheet l HIS ATTORNEY June 17, 1930. BUTTOLPH 1,764,148

MERCURY VAPOR LAMP AND APPARATUS Original Filed Sept. 27. 1923 2 hee s-She 2 OPEN FOR D-C. CLOSED FOR AC.

HIS ATTORNEY Patented June 17, 1930 UNITED STATES PATENT OFFICE LEROY J. BUTTOLPHgOI' GBANTWOOD, NEW JERSEY, .ASSIGNOE TO GENERAL ELECTRIC VAPOR LAMP COMPANY, A CORPORATION 01 NEW JERSEY MERCURY VAPOR. LAMP AND APPARATUS Original application iiled September 27, 1923, Serial No. 665,069. Divided and. this application flied April 18, 1925. Serial m 24,066.

This invention relates to mercury arc lamps for laboratory and experimental use and to apparatus therefor.

Previously for use in commercial and re- 5 search work there were available only the large mercury-arc lamps such as are used for oilice and factory illumination. But at best the apparatus contrived is necessarily cumbersome and unwieldly.

The purpose of my invention is to provide a lamp of small size operable on ordinary lighting voltages.

Another purpose of my invention is to provide means in a mercury pool lamp for retarding the flow of mercury thereat and prevent the hammer of the mercury against the glass wall which in shipment and movement of the lamps often causes the breaking of the wall at seal-ins, etc., or weakens the glass so much as to greatly decrease the len h of life of the lamp.

nother purpose of this invention is to rovide a small mercury arc lamp adaptable or various illumination purposes such as for use in connection with microscopes, spectroscopes, polarimeters, interferometers, etc.

quartz are available including a very complete series of ultra violet lines. In the visible range very pure lines'can be isolated with monochromatic fillers, some of which have been developed for yellow, green, blue and violet lines,

In the drawings forming part of this application: I

Fig. 1 is a plan view showing an arrangement of apparatus for use with a lamp of my invention an embodiment of which is shown in my conding application Serial Number 665,069 led September 27, 1923.

Fig. 2 is a diagrammatic representation of the apparatus of Fig. 1.

Fig. 3 is a dia ammatic representation of the apparatus 0 Fig. 1 as connected to the lam described in the above referredto copen ing application.

Fig. 4 is a diagrammatic representation of the lamp with apparatus for use with alternating currents, and

Fig. 5 is a diagrammatic representation of the lamp with connections for use on direct current lines.

In Fig. l is shown the arrangement of the Another purpose of this invention is to auxiliar apparatus of the lamp as arranged provide an arc lamp for use in laboratories where a light of standard wave length is desired and as for use in the study of sugar polarimetry, interferometry, spectrometry,

, etc.

Another purpose of this invention is to provide a source of high intensity near and far ultra violet radiations of such wave lengths as are transmitted by fused quartz whereby it may be used'at high or low voltages or on alternating or direct current.

By using a fused quartz tube mercuryarc lamp as a light source the princ1pal lines from the 10, 140 A line in the infra red to those in the extreme ultra violet up to the limits of transmission of the clear fused on the ass. The two mains, 6 and 7, are connected to the terminals, 21 and 22, respectively. From 21 a lead passes to-one side of the transformer, 14, and another lead, 3, passes to one of the slots of the socket 42. The other end of the transformer, 14, is connected by lead, 4, to another slot in the socket, 42. From the terminal, 22, a connection is made to one side of he resistance, 27 lead, 20, connects the other side of the resistance, 27, to one side of the inductance, 16. The other side of the inductance is connected by lead 5 to a third slot in the socket, 42. From a midpoint of the transformer, 14, a lead 19 connects through a switch 17 to a terminal on the lead, 20. A dia ram of the apparatus and connections of ig. 1 is shown in Fig. 2; This apparatus connected to the lamp, 40, is shown diagrammatically in Fig. 3. Fig. 4 shows the connections of the apparatus to the lamp for the use of the lamp on alternating current and Fig. 5 shows their connections for direct current.

The lamp is started by tilting it backward to a horizontal position, mercury flowing from the cathode chamber into the anode pockets, and returning it to the vertical position whereupon the mercury flowing back again makes momentary connection between the cathode and the anode and an arc is formed thereby.

For the operation of my apparatus on alternating current I close switch 17 and con nect the alternatin supply mains to terminals 21 and 22. ne half of coil 14 now functions as the primary of an auto-transformer with the resistance 27 in series therewith in one of the leads thereto. The entire coil acts as a secondary with leads from the outside terminals of the coil to the two anodes 45 of the lamp. A lead connects the midpoint of the transformer coil throu h an inductance 16 to the cathode of the amp.- By lacing the usual arc stabiling resistance in t e primary of the auto-transformer I provide that the energy absorbed therein does not pass through the transformer circuit and the transformer capacity is kept at a lower value than would be possible with the stabilizing resistance connected in the cathode lead or in the two anode leads. This arrangement also provides that the voltages between the outside terminals of the transformer and therefor between the lamp anodes are kept at a minimum value and so minimizes any tendency to arcing between the anodes of the lamp which as can be seen acts as a rectifier. Also the resistance in the primary circuit serves to limit the primary current and to protect the transformer in case of a short circuit between the secondary terminals. For use on direct current I open switch 17 and thereby disconnect the midpoint of the auto-transformer from both the supply mains 7 and the cathode. This leaves the main 7 connected through the stabilizing resistance 27 and coil 16 to the cathode. Main 6 is connected to both the anodes of the lamp, the coil 14 remaining in one of the branches thereto. If conditions require, I shunt coil 14 by a short-circuiting switch.

This ap lication is a division of my application gerial No. 665,069, filed September 27 1923.

I claim:

1. In an electric vapor lamp circuit, in combination, a vapor arc lamp having a cathode and two anodes, an inductance connected at one end to said cathode and at its other end to a resistance, said resistance being connected at its other end to a power main, an auto-transformer connected across said anodes, means for connecting at will an intermediate point on said auto-transformer to the line leading to the cathode, and another point on said auto-transformer connected to another power main.

2. In an electric vapor lamp circuit, in

combination, a vapor arc lamp having a cathode and -two anodes, an inductance connected at one end to said cathode and at its other end to a resistance, said resistance being connected at its other end to a power main, an auto-transformer connected across said anodes, means for connecting at will an intermediate point on said auto-transformer to a point between said inductance and said resistance, and another point on said autotransformer connected to another power main.

Signed at Hoboken, in the county of Hudson and State of New Jersey this 17th day of April, A. D. 1925.

LEROY J. BUTTOLPH.

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