GB117231A - Improvements in and relating to Microphones. - Google Patents

Improvements in and relating to Microphones.

Info

Publication number
GB117231A
GB117231A GB229318A GB229318A GB117231A GB 117231 A GB117231 A GB 117231A GB 229318 A GB229318 A GB 229318A GB 229318 A GB229318 A GB 229318A GB 117231 A GB117231 A GB 117231A
Authority
GB
United Kingdom
Prior art keywords
microphones
held
ring
relating
asbestos
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
GB229318A
Inventor
Paul Jay Hackett
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 GB229318A priority Critical patent/GB117231A/en
Priority to FR489369D priority patent/FR489369A/en
Publication of GB117231A publication Critical patent/GB117231A/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
    • H04R21/00—Variable-resistance transducers
    • H04R21/02—Microphones
    • H04R21/021—Microphones with granular resistance material

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)

Abstract

117,231. Hackett, P. J. Feb. 8, 1918. Microphones.-A microphone cell 2, closed by a mica diaphragm 7 held in position by a clamp ring 9 is provided with a packing-ring 11 of fluffy asbestos. The ring 11 is held in position by a few shreds of the asbestos held between the edge of the cell 2 and the diaphragm 7.
GB229318A 1918-02-08 1918-02-08 Improvements in and relating to Microphones. Expired GB117231A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB229318A GB117231A (en) 1918-02-08 1918-02-08 Improvements in and relating to Microphones.
FR489369D FR489369A (en) 1918-02-08 1918-03-20 Improvements in microphones

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB229318A GB117231A (en) 1918-02-08 1918-02-08 Improvements in and relating to Microphones.

Publications (1)

Publication Number Publication Date
GB117231A true GB117231A (en) 1918-07-11

Family

ID=32243718

Family Applications (1)

Application Number Title Priority Date Filing Date
GB229318A Expired GB117231A (en) 1918-02-08 1918-02-08 Improvements in and relating to Microphones.

Country Status (2)

Country Link
FR (1) FR489369A (en)
GB (1) GB117231A (en)

Also Published As

Publication number Publication date
FR489369A (en) 1919-01-27

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