GB303476A - - Google Patents

Info

Publication number
GB303476A
GB303476A GB36866/28A GB3686628A GB303476A GB 303476 A GB303476 A GB 303476A GB 36866/28 A GB36866/28 A GB 36866/28A GB 3686628 A GB3686628 A GB 3686628A GB 303476 A GB303476 A GB 303476A
Authority
GB
United Kingdom
Prior art keywords
metal
envelope
alkali
filament
heating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB36866/28A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Publication of GB303476A publication Critical patent/GB303476A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J40/00—Photoelectric discharge tubes not involving the ionisation of a gas
    • H01J40/02—Details
    • H01J40/04—Electrodes
    • H01J40/06—Photo-emissive cathodes

Landscapes

  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
  • Particle Accelerators (AREA)

Abstract

303,476. British Thomson-Houston Co., Ltd., (Assignees of Bainbridge, K. T.). Jan. 4, 1928, [Convention date]. Vacuum tubes.-A photoelectric cell has a light-sensitive electrode consisting of a foundation metal such as silver, copper, nickel, tungsten, or barium, having an oxygen-containing layer on its surface and coated with a monatomic layer of caesium or other alkali or alkaline earth metal, the cell containing no free alkali &c. metal. A silver bead, attached to a filament 4, is vaporized by passage of current through the filament and deposited on the envelope. An anode in the form of a disc 6 prevents deposition in one direction so as to provide a window 5. A mica or quartz washer 7 mounted on the filament-supports prevents deposition on the neck. The silver coating is oxidized by admitting oxygen to a pressure of 100 microns of mercury, and applying a spark coil so as to produce a discharge, or heating the envelope in an exhaust oven to 360‹C for a few minutes. Excess oxygen is pumped out and caesium, rubidium, potassium, or calcium is distilled into the envelope by heating the metal in capillary tubes 9, secured to a metal disc 11 by straps 12. Excess alkali &c. metal is removed by connecting the envelope with an exhaust pump and heating to 300‹ C. for a period of time varying from a few minutes to two hours and depending on the amount of alkali metal present. When barium is used as the light-sensitive metal, the envelope is made of quartz, and is heated to 700‹ C. Specifications 302,315 and 306,996 are referred to.
GB36866/28A 1928-01-04 1928-12-13 Expired GB303476A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US303476TA 1928-01-04 1928-01-04

Publications (1)

Publication Number Publication Date
GB303476A true GB303476A (en) 1929-11-28

Family

ID=31945837

Family Applications (1)

Application Number Title Priority Date Filing Date
GB36866/28A Expired GB303476A (en) 1928-01-04 1928-12-13

Country Status (1)

Country Link
GB (1) GB303476A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE909143C (en) * 1948-10-02 1954-04-15 Optische Werke C A Steinheil S Process for the production of transparent reflection-increasing or -reducing surface layers on glasses or other light-reflecting materials

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE909143C (en) * 1948-10-02 1954-04-15 Optische Werke C A Steinheil S Process for the production of transparent reflection-increasing or -reducing surface layers on glasses or other light-reflecting materials

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