GB191505838A - Improvements in or relating to Thermic Telephones. - Google Patents

Improvements in or relating to Thermic Telephones.

Info

Publication number
GB191505838A
GB191505838A GB191505838DA GB191505838A GB 191505838 A GB191505838 A GB 191505838A GB 191505838D A GB191505838D A GB 191505838DA GB 191505838 A GB191505838 A GB 191505838A
Authority
GB
United Kingdom
Prior art keywords
cap
relating
chamber
openings
thermic
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
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.)
DE NL THERMO TELEPHOON MIJ NV
Original Assignee
DE NL THERMO TELEPHOON MIJ NV
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 DE NL THERMO TELEPHOON MIJ NV filed Critical DE NL THERMO TELEPHOON MIJ NV
Publication of GB191505838A publication Critical patent/GB191505838A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R23/00—Transducers other than those covered by groups H04R9/00 - H04R21/00
    • H04R23/002—Transducers other than those covered by groups H04R9/00 - H04R21/00 using electrothermic-effect transducer

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
  • Catching Or Destruction (AREA)
  • Respiratory Apparatuses And Protective Means (AREA)
  • Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
  • Building Environments (AREA)
  • Connections Arranged To Contact A Plurality Of Conductors (AREA)

Abstract

5838. Noamlooze Vennootschap de Nederlandsche Thermo - Telephoon Maatschappij. Feb 11, [Convention date]. Hot - wire receivers; earpieces. - In a thermic telephone, the crosssectional area. of the sound passages is adjustable. In the form shown, the tubular casing 3 containing the filaments 2 is formed at its upper end with a sound chamber 5 communicating with a second chamber 7 closed by a cap 8. The tube 3 and cap 8 are surrounded by a rotatable sleeve 11, the openings 10, 12 in which may be brought more or less into register with similar openings 9, 13 in the cap 8 and casing 3.
GB191505838D 1915-02-11 1915-04-19 Improvements in or relating to Thermic Telephones. Expired GB191505838A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE191505838X 1915-02-11

Publications (1)

Publication Number Publication Date
GB191505838A true GB191505838A (en) 1916-04-19

Family

ID=32668494

Family Applications (2)

Application Number Title Priority Date Filing Date
GB191505837D Expired GB191505837A (en) 1915-02-11 1915-04-19 A Thermic Microphone.
GB191505838D Expired GB191505838A (en) 1915-02-11 1915-04-19 Improvements in or relating to Thermic Telephones.

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB191505837D Expired GB191505837A (en) 1915-02-11 1915-04-19 A Thermic Microphone.

Country Status (5)

Country Link
US (1) US1389242A (en)
AT (1) AT76294B (en)
DK (1) DK21413C (en)
FR (1) FR480858A (en)
GB (2) GB191505837A (en)

Also Published As

Publication number Publication date
US1389242A (en) 1921-08-30
DK21413C (en) 1916-08-07
GB191505837A (en) 1916-04-19
FR480858A (en) 1916-10-04
AT76294B (en) 1919-04-25

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