GB244516A - Improvements in sound recorders, sound amplifying devices, and microphones - Google Patents

Improvements in sound recorders, sound amplifying devices, and microphones

Info

Publication number
GB244516A
GB244516A GB2187924A GB2187924A GB244516A GB 244516 A GB244516 A GB 244516A GB 2187924 A GB2187924 A GB 2187924A GB 2187924 A GB2187924 A GB 2187924A GB 244516 A GB244516 A GB 244516A
Authority
GB
United Kingdom
Prior art keywords
coil
sound
flat
microphones
pieces
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
GB2187924A
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.)
WILLIAM SPENCER PURSER
Original Assignee
WILLIAM SPENCER PURSER
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 WILLIAM SPENCER PURSER filed Critical WILLIAM SPENCER PURSER
Priority to GB2187924A priority Critical patent/GB244516A/en
Publication of GB244516A publication Critical patent/GB244516A/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
    • H04R9/06—Loudspeakers

Abstract

244,516. Purser, W. S. Sept. 16, 1924. Magnetic instruments. -- In sound recorders, sound-amplifying devices, or loud-speakers, and microphones of the kind comprising a coil movable bodily between magnet pole-pieces, a plane coil is mounted between two pole-pieces with adjacent, flat, active faces parallel to the plane of the coil. In a loud speaker, a flat spiral coil b, Fig. 1, carrying the incoming telephone currents is mounted at right angles to the diaphragm a and moves in and out with one half of the coil in the narrow air-gap between the flat faces of polepieces d of an electromagnet c. The air-gap may be adjustable and may be filled with sponge rubber or with oil or other liquid held by capillary attraction. The coil of fine, insulated wire may have retaining sides of mica &c., the whole being impregnated with wax or varnish, or may be made rigid without retaining sides by impregnation. In a modification, the coil is wound as shown in Fig. 5, each flattened end being placed in a magnetic field and the centre being used for the mounting or suspension of the coil.
GB2187924A 1924-09-16 1924-09-16 Improvements in sound recorders, sound amplifying devices, and microphones Expired GB244516A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2187924A GB244516A (en) 1924-09-16 1924-09-16 Improvements in sound recorders, sound amplifying devices, and microphones

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2187924A GB244516A (en) 1924-09-16 1924-09-16 Improvements in sound recorders, sound amplifying devices, and microphones

Publications (1)

Publication Number Publication Date
GB244516A true GB244516A (en) 1925-12-16

Family

ID=10170342

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2187924A Expired GB244516A (en) 1924-09-16 1924-09-16 Improvements in sound recorders, sound amplifying devices, and microphones

Country Status (1)

Country Link
GB (1) GB244516A (en)

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