GB191102985A - Improvements in Acoustical Instruments. - Google Patents

Improvements in Acoustical Instruments.

Info

Publication number
GB191102985A
GB191102985A GB191102985DA GB191102985A GB 191102985 A GB191102985 A GB 191102985A GB 191102985D A GB191102985D A GB 191102985DA GB 191102985 A GB191102985 A GB 191102985A
Authority
GB
United Kingdom
Prior art keywords
lt
gt
improvements
surfaces
equal
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
Inventor
Louis Lumiere
Original Assignee
Louis Lumiere
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
Priority to FR191102985X priority Critical
Application filed by Louis Lumiere filed Critical Louis Lumiere
Application granted granted Critical
Publication of GB191102985A publication Critical patent/GB191102985A/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
    • H04R1/00Details of transducers, loudspeakers or microphones
    • H04R1/20Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
    • H04R1/30Combinations of transducers with horns, e.g. with mechanical matching means, i.e. front-loaded horns

Abstract

2985. LumiÞre, L. March 3, 1910, [Convention date]. Stethoscopes. - The mouthpiece of a stethoscope or the like having a stationary wall band a rigid movable wall e connected by a flexible material as described in Specification 27,945/10 has the contours of the two walls so shaped that the surfaces of cylindrical sections concentric with the air-exit axis are all equal. Thus the surfaces of the cylindrical sections D<1> H<1>, D<2> H<2>, and D<3> H<3> are all equal.
GB191102985D 1910-03-03 1911-02-06 Improvements in Acoustical Instruments. Expired GB191102985A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR191102985X 1910-03-03

Publications (1)

Publication Number Publication Date
GB191102985A true GB191102985A (en) 1912-02-01

Family

ID=32480888

Family Applications (1)

Application Number Title Priority Date Filing Date
GB191102985D Expired GB191102985A (en) 1910-03-03 1911-02-06 Improvements in Acoustical Instruments.

Country Status (1)

Country Link
GB (1) GB191102985A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106456104A (en) * 2014-04-16 2017-02-22 邦吉欧维声学有限公司 Device for wide-band auscultation

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106456104A (en) * 2014-04-16 2017-02-22 邦吉欧维声学有限公司 Device for wide-band auscultation

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