GB330245A - Improvements in instruments for recording and reproducing sound - Google Patents

Improvements in instruments for recording and reproducing sound

Info

Publication number
GB330245A
GB330245A GB681429A GB681429A GB330245A GB 330245 A GB330245 A GB 330245A GB 681429 A GB681429 A GB 681429A GB 681429 A GB681429 A GB 681429A GB 330245 A GB330245 A GB 330245A
Authority
GB
United Kingdom
Prior art keywords
stylus
lever
secured
coil
split
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
GB681429A
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.)
NATHANIEL MARSHALL
Original Assignee
NATHANIEL MARSHALL
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 NATHANIEL MARSHALL filed Critical NATHANIEL MARSHALL
Priority to GB681429A priority Critical patent/GB330245A/en
Publication of GB330245A publication Critical patent/GB330245A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/12Gramophone pick-ups using a stylus; Recorders using a stylus

Abstract

330,245. Marshall, N., and Marshall, C. March 2, 1929. Phonographic recorders and repmodrcer.c. - A sound reproducing or recording instrument incorporates a moving coil in a constant magnetic field, the coil being actuated by a stylus lever and mounted on an annular element secured to a flexible sheet, for which tensioning means are provided. The moving coil 5, Fig. 1, is wound on a slotted annulus 10 having a cross-shaped spider by which it is secured by riveting to the stylus lever 7 and a flexible sheet 6 of silk stretched across the front face of the electromagnet 1, the tension being adjusted by screws 17. The lever 7 is pivoted in bearings 8 and carries a stylus or cutter 9 which may be secured by a split carrier inserted in the lower end of the lever. To prevent eddy currents, the end of the tubular magnet pole 2 has copper strips inserted in slots; the flange 3 may also be slotted to receive copper strips 13, Fig. 2. The moving coil may be damped by inserting oil in the front of the case behind the silk 6 or alternatively a short-circuited coil may be provided on the sleeve, 2. The instrument is mounted on the arm 19 by means of a split member 20 in conjunction with a wedge member 21, the arrangement being such that on drawing up the wedge 21 by means of the screw 22 the split member is expanded into intimate contact with the tubular pole 2 of the electromagnet. In this way the operative angle of the stylus or cutter may also be adjusted.
GB681429A 1929-03-02 1929-03-02 Improvements in instruments for recording and reproducing sound Expired GB330245A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB681429A GB330245A (en) 1929-03-02 1929-03-02 Improvements in instruments for recording and reproducing sound

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB681429A GB330245A (en) 1929-03-02 1929-03-02 Improvements in instruments for recording and reproducing sound

Publications (1)

Publication Number Publication Date
GB330245A true GB330245A (en) 1930-06-02

Family

ID=9821236

Family Applications (1)

Application Number Title Priority Date Filing Date
GB681429A Expired GB330245A (en) 1929-03-02 1929-03-02 Improvements in instruments for recording and reproducing sound

Country Status (1)

Country Link
GB (1) GB330245A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2858375A (en) * 1955-10-11 1958-10-28 Rca Corp Wide range dynamic phonograph pickup

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2858375A (en) * 1955-10-11 1958-10-28 Rca Corp Wide range dynamic phonograph pickup

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