GB304709A - Improvements in or relating to telephonic sound reproducing instruments - Google Patents

Improvements in or relating to telephonic sound reproducing instruments

Info

Publication number
GB304709A
GB304709A GB2838127A GB2838127A GB304709A GB 304709 A GB304709 A GB 304709A GB 2838127 A GB2838127 A GB 2838127A GB 2838127 A GB2838127 A GB 2838127A GB 304709 A GB304709 A GB 304709A
Authority
GB
United Kingdom
Prior art keywords
adjustable
sound reproducing
relating
limbs
field magnet
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
GB2838127A
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.)
GRAHAM AMPLION Ltd
NELSON THOMAS CARNE
Original Assignee
GRAHAM AMPLION Ltd
NELSON THOMAS CARNE
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 GRAHAM AMPLION Ltd, NELSON THOMAS CARNE filed Critical GRAHAM AMPLION Ltd
Priority to GB2838127A priority Critical patent/GB304709A/en
Publication of GB304709A publication Critical patent/GB304709A/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
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Magnetic Treatment Devices (AREA)

Abstract

304,709. Graham Amplion, Ltd., Rickets, W. J., and Carne, N. T. Oct. 25, 1927. Electromagnets. - The field magnet of a moving coil sound reproducing instrument has adjustable poles to facilitate adjustment of the air gap in which the coil moves. As shown in Fig. 1, the outer limbs 3 of the field magnet are adjustable by screws 4 working through extensions 5 of a ring 6. In a modification the limbs 3 are collectively adjustable by an embracing collar. In a further modification, two outer limbs 3<a>, Fig. 3, are adjustable relatively to the central pole 2.
GB2838127A 1927-10-25 1927-10-25 Improvements in or relating to telephonic sound reproducing instruments Expired GB304709A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2838127A GB304709A (en) 1927-10-25 1927-10-25 Improvements in or relating to telephonic sound reproducing instruments

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2838127A GB304709A (en) 1927-10-25 1927-10-25 Improvements in or relating to telephonic sound reproducing instruments

Publications (1)

Publication Number Publication Date
GB304709A true GB304709A (en) 1929-01-25

Family

ID=10274745

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2838127A Expired GB304709A (en) 1927-10-25 1927-10-25 Improvements in or relating to telephonic sound reproducing instruments

Country Status (1)

Country Link
GB (1) GB304709A (en)

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