US881588A - Method of exhausting vapor-conductors. - Google Patents

Description

No. 881,588. PATENTED MAR. 10, 1908. A. MoL. JACKSON. METHOD OF EXHAUSTING VAPOR GONDUGTORS.

APPLIGATION FILED AUG. 4. 1903.

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To all whom it may. concern-.-

Be it known that I, ALEXANDER MoL. Jackson, a subject of the King of Great Britain, residing at Schenectady,county of Schenectady, State of New York, have invented certain new and useful Improvements in l\le thods of Exhausting V apor-Conductors, of which the following is a specificat-ion..

' My invention relates to a method of exhausting receptacles of that type in which, when exhausted, current is conveyed through the medium of a conducting vapor.

My invention may be applied to vapor conductors in the form of reeti'liers, lamps, interrupters or the like and is more particularly applicable to that type of vapor conductor in which the envelop or receptacle is provided with a condensing chamber, either tubular or bulbous, located out of the path of the arc stream traversed by the current, but communicating therewith.

I have found that if a vapor conductor having a condensing chamber arranged as above mentioned be exhausted through a tube communicating with the main envelop at a point near the are stream or its extremities, that after the exhaustion has proceeded as far as possible with the are stream in operation, gas will continue to be given off after the are stream is diseontimurd. This gas apparently comes from the condensing chamber and, while the arc is in existence, is apparently retained therein by a superior pressure in the envelop immediately inelosmg the are.

I have found that the complete exhaustion of the envelop may be greatly expedited by exhausting, from the condensing chamber and es )ecially from a point therein distant from the. point or region of communication between the condensing chamber and the arc stream. -By exhausting in this manner I find that no gas is given off after the arc in the main envelop is stopped.

The drawings illustrate the method of exhaustion above described and show this method'as applied to the exhaustion of a mercury vapor lamp. The drawings, how ever, are intended to serve merely as illustrations, since it will readil be understood that the method is applicable in numerous other relations than the one shown.

In the drawings a mercury vapor lamp of a ("ll-\DI, NEW roan, ASSIUNUR To Inherit-1e eon m x Y, eoaeoievrn Specification of Letters Patent. application filed August 4, 1903. Serial No. 168,158.

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Patented March 10,; 1908.

v I well-known tygp, as shown for examplein British Patent 0. 8717 of 1902 is indicated. This lamp consists of a main tube 1 in which the 'main are or current flow takes place, and a communicating supplemental tube or condensing chamber 2 jolned therewith by conmeeting walls 3. In the upper end of the tube 1 an electrode 4, of artificial graphite titanium carbid or other suitable material is held in place by and electrically connected to, the depending leading-in conductor 5. A carbon 6o filament 6 depends from this electrode and extends downward to within a short distance of a body of mercury 7. This body of mercury is contained within the cups 8 and 9 formed respectively at the lower ends of the tubes 1 and 2, and is of suiiicient quantity to bridge over the wall 3 between these cups.

Leading-in conductors 10 and 11 serve to make electrical connections with the mercury in the two cups. A iloat 12 consisting of a glass tube filled with iron serves, when acted upon by a solenoid 13 located about the tube 2, to separate the body of mercury across the bridge 3. This separation causes a starting arc to spring which has the effect of starting the are in the main tube 1. The construction of the lamp, not being of my invention, requires no further description.

During exhaustion of the lamp, the exhaust pump 14 is connected as shown through a tube 15 extending from the top of the condenser chamber 2. When exhausted in this-manner instead of solely from the top of the tube 1, as has heretofore been customary, the stopping of the arc in the main tube 1, after the exhaustion has apparently been carried as far as possible, is not followed by a further giving off of gas as would be the case if the exhaustion were carried out entirely from the top of the tube 1. The time spent in exhausting the envelop is thus very much less than is required if the exhaustion be carried out entirely from the top of the tube 1.

In addition to exhausting the envelop from the top of the condensing chamber, I may, if desired, in order to still further shorten the exhausting operation, conduct the exhaustion also from the top of the main tube 1. In this case the additional exhaust tube 16, with the flexible connection 17, may be provided. This exhaust tube hastens the withdrawal of the gases given oil' by the anode 4.

Stop cocks 18 and 19 serve to open and close the tubes 15 and 16 so that either may be used separately or both together.

When the exhaustion is completed the 1 tube or tubes through which the exhaustion is conducted are sealed oil as usual.

What 1 claim as new and desire to secure by Letters Patent of the United States, is,

1. The method of exhausting a vapor electric apparatus having an envelop or receptacle provided with a condensing chamber and with a main operating chamber traversed by the arc stream, which consists in conducting the exhaustion both from the condensing chamber and from the main operating chamber or portion traversed by the are stream, and maintaining the are or normal discharge during the operation of exhaustion.

2. The method of exhausting a vapor electric apparatus having an envelop or receptacle provided with communicating chambers each containing an electrode, which consists in conducting the exhaustion simulta neously from points communicating with the envelop or receptacle in the one case near one electrode and in the other case near another electrode, and maintaining an arc in the envelop while the exhaustion is proceeding.

3. The method of exhausting a vapor electric apparatushaving a receptacle or container consisting of a main body portion and a cooperating portion serving as a condensing chamber and communicating with the main body portion, which consists in conducting the exhaustion both from the condensing chamber and from the main body of the receptacle, and at the same time maintaining an are or discharge in the apparatus.

4. The method of exhausting a vapor electric apparatus consisting of a receptacle or container provided with communicating chambers, which consists in conducting the exhaustion from said chambers simultaneously and, while the exhaustion is procecding, maintaining an arc in said receptacle.

In witness whereof, I have hereunto set my hand this first day of August, 1903.

ALEXANDER Mcblllll) JACKSON. Witnesses BENJAMIN B. HULL, HELEN ORFORD.

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