GB151336A - Improvements in or relating to telephones - Google Patents

Improvements in or relating to telephones

Info

Publication number
GB151336A
GB151336A GB1535219A GB1535219A GB151336A GB 151336 A GB151336 A GB 151336A GB 1535219 A GB1535219 A GB 1535219A GB 1535219 A GB1535219 A GB 1535219A GB 151336 A GB151336 A GB 151336A
Authority
GB
United Kingdom
Prior art keywords
ear
diaphragm
telephones
receiver
carbon
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
GB1535219A
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.)
Telephone Manufacturing Co Ltd
Original Assignee
Telephone Manufacturing 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 Telephone Manufacturing Co Ltd filed Critical Telephone Manufacturing Co Ltd
Priority to GB1535219A priority Critical patent/GB151336A/en
Priority to FR517394D priority patent/FR517394A/en
Publication of GB151336A publication Critical patent/GB151336A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/03—Constructional features of telephone transmitters or receivers, e.g. telephone hand-sets

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Headphones And Earphones (AREA)

Abstract

151,336. Murray, R. L., and Telephone Manufacturing Co. June 18, 1919. Microphones; head sets; earpieces.-Relates to telephones, particularly for air. men and divers, in which a small microphone is strapped against the speaker's throat or neck. To prevent the speaking circuit from being broken when the diaphragm is horizontal, a sharp-edged pyramid of carbon D is attached to the diaphragm and projects among the granules through an aperture B<1> in the end wall of the carbon chamber B. The receiver carries a funnel-shaped member F for insertion in the ear. According to the Provisional Specification, the receiver may be held in position by a hook fitting round the user's ear.
GB1535219A 1919-06-18 1919-06-18 Improvements in or relating to telephones Expired GB151336A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB1535219A GB151336A (en) 1919-06-18 1919-06-18 Improvements in or relating to telephones
FR517394D FR517394A (en) 1919-06-18 1920-06-17 Phone enhancements

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1535219A GB151336A (en) 1919-06-18 1919-06-18 Improvements in or relating to telephones

Publications (1)

Publication Number Publication Date
GB151336A true GB151336A (en) 1920-09-20

Family

ID=10057617

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1535219A Expired GB151336A (en) 1919-06-18 1919-06-18 Improvements in or relating to telephones

Country Status (2)

Country Link
FR (1) FR517394A (en)
GB (1) GB151336A (en)

Also Published As

Publication number Publication date
FR517394A (en) 1921-05-04

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