GB293483A - Improvements in or relating to electrical reproduction of sound from records - Google Patents

Improvements in or relating to electrical reproduction of sound from records

Info

Publication number
GB293483A
GB293483A GB958427A GB958427A GB293483A GB 293483 A GB293483 A GB 293483A GB 958427 A GB958427 A GB 958427A GB 958427 A GB958427 A GB 958427A GB 293483 A GB293483 A GB 293483A
Authority
GB
United Kingdom
Prior art keywords
needle
magnet
screws
damped
secured
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
GB958427A
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.)
LAURENCE HERBERT PEARSON
Original Assignee
LAURENCE HERBERT PEARSON
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 LAURENCE HERBERT PEARSON filed Critical LAURENCE HERBERT PEARSON
Priority to GB958427A priority Critical patent/GB293483A/en
Publication of GB293483A publication Critical patent/GB293483A/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
    • H04R11/00—Transducers of moving-armature or moving-core type
    • H04R11/08—Gramophone pick-ups using a stylus; Recorders using a stylus

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Electromagnets (AREA)

Abstract

293,483. Pearson, L. H., and Marshall, C. April 7, 1927. Magnetic instruments. -An electromagnetic sound - reproducing device comprising a damped armature resiliently mounted at its upper part and vibrated by a needle from a record, has the damping means arranged within the magnet poles and the needle-clamping screw is positioned and extended so as to permit of changing the needle without disturbing the dampers. A permanent horse-shoe magnet 1 carrying a split socket 5 for attachment to a tone-arm has detachable hollow pole pieces 1<a> secured by hollow screws 10 and supporting the coils 2, leads from which pass to terminals 4 on an insulating bridge piece 3. A metal armature 7 of rectangular section is suspended by a flexible strip from a block 6 secured to the magnet bridge, and its vibrations are damped by rubber blocks 12 mounted in the pole pieces and resting against plungers 11 adjustable by screws 13 engaging the hollow screws 10.
GB958427A 1927-04-07 1927-04-07 Improvements in or relating to electrical reproduction of sound from records Expired GB293483A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB958427A GB293483A (en) 1927-04-07 1927-04-07 Improvements in or relating to electrical reproduction of sound from records

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB958427A GB293483A (en) 1927-04-07 1927-04-07 Improvements in or relating to electrical reproduction of sound from records

Publications (1)

Publication Number Publication Date
GB293483A true GB293483A (en) 1928-07-09

Family

ID=9874818

Family Applications (1)

Application Number Title Priority Date Filing Date
GB958427A Expired GB293483A (en) 1927-04-07 1927-04-07 Improvements in or relating to electrical reproduction of sound from records

Country Status (1)

Country Link
GB (1) GB293483A (en)

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