GB188371A - Improvements in and relating to gramophones, phonographs and the like - Google Patents

Improvements in and relating to gramophones, phonographs and the like

Info

Publication number
GB188371A
GB188371A GB2059321A GB2059321A GB188371A GB 188371 A GB188371 A GB 188371A GB 2059321 A GB2059321 A GB 2059321A GB 2059321 A GB2059321 A GB 2059321A GB 188371 A GB188371 A GB 188371A
Authority
GB
United Kingdom
Prior art keywords
disc
poles
magnetic
phonographs
permanent 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
GB2059321A
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.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston 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 British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Priority to GB2059321A priority Critical patent/GB188371A/en
Publication of GB188371A publication Critical patent/GB188371A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B17/00—Guiding record carriers not specifically of filamentary or web form, or of supports therefor
    • G11B17/02—Details
    • G—PHYSICS
    • G12—INSTRUMENT DETAILS
    • G12B—CONSTRUCTIONAL DETAILS OF INSTRUMENTS, OR COMPARABLE DETAILS OF OTHER APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G12B3/00—Details of movements not otherwise provided for
    • G12B3/08—Damping of movements, e.g. to promote rapid non-oscillatory movement to a final reading
    • G12B3/10—Damping of movements, e.g. to promote rapid non-oscillatory movement to a final reading using eddy currents

Abstract

188,371. British Thomson-Houston Co., Ltd., and Young, A. P. Aug. 2, 1921. Electric and magnetic.- For regulating the speed of a gramophone or the Like, a disc of conducting material is mounted on the record-carrying spindle, and caused to pass between the poles of a permanent magnet, the position of which is adjustable or the magnetic field variable. In the device shown in Fig. 1, the permanent magnet 2, between the poles of which the conducting disc 1 rotates, is mounted on a non-magnetic pin 3, so that it can be rotatably adjusted by means of a nut 4 in order to vary the position of the poles with respect to the periphery of the disc. Fig. 3 shows a modification in which the magnetic field through the disc 1. is varied by altering the distance between secondary pole-pieces 7 and 8, which provide a magnetic circuit in shunt with the main polepieces. Specification 17247/15, [Class 40 (ii), Phonographs &c.], is referred to.
GB2059321A 1921-08-02 1921-08-02 Improvements in and relating to gramophones, phonographs and the like Expired GB188371A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2059321A GB188371A (en) 1921-08-02 1921-08-02 Improvements in and relating to gramophones, phonographs and the like

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2059321A GB188371A (en) 1921-08-02 1921-08-02 Improvements in and relating to gramophones, phonographs and the like

Publications (1)

Publication Number Publication Date
GB188371A true GB188371A (en) 1922-11-02

Family

ID=10148482

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2059321A Expired GB188371A (en) 1921-08-02 1921-08-02 Improvements in and relating to gramophones, phonographs and the like

Country Status (1)

Country Link
GB (1) GB188371A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2934187A (en) * 1957-02-25 1960-04-26 Thorens Sa Speaking machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2934187A (en) * 1957-02-25 1960-04-26 Thorens Sa Speaking machine

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