US1833117A - Method and arrangement for dispersing magnesium in vacuum tubes - Google Patents

Method and arrangement for dispersing magnesium in vacuum tubes Download PDF

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Publication number
US1833117A
US1833117A US229104A US22910427A US1833117A US 1833117 A US1833117 A US 1833117A US 229104 A US229104 A US 229104A US 22910427 A US22910427 A US 22910427A US 1833117 A US1833117 A US 1833117A
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United States
Prior art keywords
magnesium
anode
arrangement
vacuum tubes
piece
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Expired - Lifetime
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US229104A
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English (en)
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Loewe Siegmund
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Individual
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Individual
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J7/00—Details not provided for in the preceding groups and common to two or more basic types of discharge tubes or lamps
    • H01J7/14—Means for obtaining or maintaining the desired pressure within the vessel
    • H01J7/18—Means for absorbing or adsorbing gas, e.g. by gettering
    • H01J7/186—Getter supports

Definitions

  • the invention relates to a method and an arrangement for dispersing magnesium in vacuum tubes.
  • the magnesium to be dispersed has been spread upon a part of the system made to glow during the process of air-evacuation, as a rule the anode of the amplification tube, either direct or indirect by placing upon it a heat conductive medium, for instance a strip of nickel plate.
  • the dispersal of the magnesium was then efiected by heat conduction and radiation from the glowing anode.
  • the glowing anodes and system-elements are still evolving comparatively large quantities of gas at a time when the dispersal of the magnesium is already taking place. In such cases the vacuum obtained after the dispersal is generally by no means complete.
  • An improvement according to my invention is obtained by the magnesium not being fixed direct to the anode, but to the point 5 of a short stem 6 which generally consists 0 of nickelplate and is welded on to the anode 3. Under these conditions it is possible to bring anode 3 to bright incandes'cence and thus to accomplish an extensive extraction of before by heat conduction across stem 6 the magnesium 5 reached red heat and evaporation. This process, however, also has the drawback that during the dispersal of the magnesium the anode 3 reaches a higher temperature than was the case during the preced ing part of the pump process. This had to be so of necessity as otherwise the magnesium ring or ribbon 5 would already have evaporated at an earlier stage.
  • the vaporizable substance has been arranged as a small perforated disc at a holder connected with the anode.
  • the piece of the vaporizable substance may slide on the holder. and may be brought close up to the anode or removed from it.
  • the motion of the vaporizable substance is attained by the following manner being illustrated in the drawing.
  • the piece of vaporizable substance is fixed to the point 12 of a small strip of mica 11 which is found m'ovably in the tube and by the tilting of which in hingelike manner the magnesium-piece may begl brought close to the anode 3 if the dispersal of the magnesium is intended.
  • the mica piece 11 remains in the tube which exercises no harmful influence. You may, of course also select a more complicated construction.
  • An electrical device having an electrode in an evacuated container, a movable mica strip within said container, said strip being supported at its lower end by said container, a vaporizable metal carried by the upper end of said strip whereby said vaporizable metal may be moved into contact with said electrode by tilting said container.

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  • Manufacture And Refinement Of Metals (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
US229104A 1926-10-26 1927-10-27 Method and arrangement for dispersing magnesium in vacuum tubes Expired - Lifetime US1833117A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE279844X 1926-10-26

Publications (1)

Publication Number Publication Date
US1833117A true US1833117A (en) 1931-11-24

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US229104A Expired - Lifetime US1833117A (en) 1926-10-26 1927-10-27 Method and arrangement for dispersing magnesium in vacuum tubes

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US (1) US1833117A (enrdf_load_stackoverflow)
GB (1) GB279844A (enrdf_load_stackoverflow)
NL (1) NL26512C (enrdf_load_stackoverflow)

Also Published As

Publication number Publication date
GB279844A (en) 1928-08-16
NL26512C (enrdf_load_stackoverflow)

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