GB220042A - Improvements in apparatus for electrically translating sound waves into light waves,and for producing a photographic record of such waves - Google Patents

Improvements in apparatus for electrically translating sound waves into light waves,and for producing a photographic record of such waves

Info

Publication number
GB220042A
GB220042A GB1183223A GB1183223A GB220042A GB 220042 A GB220042 A GB 220042A GB 1183223 A GB1183223 A GB 1183223A GB 1183223 A GB1183223 A GB 1183223A GB 220042 A GB220042 A GB 220042A
Authority
GB
United Kingdom
Prior art keywords
lamp
waves
valve
producing
light
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
GB1183223A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB1183223A priority Critical patent/GB220042A/en
Publication of GB220042A publication Critical patent/GB220042A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J17/00—Gas-filled discharge tubes with solid cathode
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0064—Tubes with cold main electrodes (including cold cathodes)

Landscapes

  • Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)

Abstract

220,042. Case, T. W. May 2, 1923. Optical apparatus.-In apparatus for recording sound photographically, a low-pressure discharge lamp is employed, comprising a bulb containing two spaced but closely associated electrodes, one or both of which include a rare earth oxide, and neither of which, if heated, is raised to bright incandescence. Oxide of thorium or cerium may be used as the active substance. The lamp contains gas such as helium or argon. The Figure shows diagrammatically an arrangement of the lamp 16 in sound-recording apparatus comprising a microphone 1 and a thermionic valve 8. The lamp circuit, which includes a battery 17 connected to the electrodes 14, 15, is coupled to the plate circuit of the valve by a transformer 12. Light from the lamp is focused as usual upon a moving film 18. The transformer 12 may be omitted, the lamp being then placed directly in the plate circuit of the valve. In the lamp shown, the cathode 14 is cylindrical, its interior being coated with the rare earth oxide. The anode 15 is straight, but in a modified construction it is in the form of a looped filament.
GB1183223A 1923-05-02 1923-05-02 Improvements in apparatus for electrically translating sound waves into light waves,and for producing a photographic record of such waves Expired GB220042A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1183223A GB220042A (en) 1923-05-02 1923-05-02 Improvements in apparatus for electrically translating sound waves into light waves,and for producing a photographic record of such waves

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1183223A GB220042A (en) 1923-05-02 1923-05-02 Improvements in apparatus for electrically translating sound waves into light waves,and for producing a photographic record of such waves

Publications (1)

Publication Number Publication Date
GB220042A true GB220042A (en) 1924-08-05

Family

ID=9993526

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1183223A Expired GB220042A (en) 1923-05-02 1923-05-02 Improvements in apparatus for electrically translating sound waves into light waves,and for producing a photographic record of such waves

Country Status (1)

Country Link
GB (1) GB220042A (en)

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