GB345326A - Improvements in sound producing devices - Google Patents

Improvements in sound producing devices

Info

Publication number
GB345326A
GB345326A GB3836729A GB3836729A GB345326A GB 345326 A GB345326 A GB 345326A GB 3836729 A GB3836729 A GB 3836729A GB 3836729 A GB3836729 A GB 3836729A GB 345326 A GB345326 A GB 345326A
Authority
GB
United Kingdom
Prior art keywords
filament
filaments
sound producing
producing devices
sound
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
GB3836729A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB3836729A priority Critical patent/GB345326A/en
Publication of GB345326A publication Critical patent/GB345326A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K15/00—Acoustics not otherwise provided for
    • G10K15/04—Sound-producing devices

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Nonwoven Fabrics (AREA)

Abstract

345,326. Wire resistances. WILSON, H. N., 50, Queensborough Terrace, Hyde Park, London. Dec. 14, 1929, No. 38367. [Class 37.] An electrically heated filament is mounted in a contracted portion of a vertical tube forming a sound-producing apparatus or fire alarm. The filament is carried in an insulating support 4, Fig. 3, which is held by plates 10, 11 in a slot in the tube. The filament may be wound spirally or zig-zag. Several shapes of heater are described, Figs. 16, 23, and 24 showing respectively a spiral filament, two filaments in parallel, and a number of filaments in series.
GB3836729A 1929-12-14 1929-12-14 Improvements in sound producing devices Expired GB345326A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3836729A GB345326A (en) 1929-12-14 1929-12-14 Improvements in sound producing devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3836729A GB345326A (en) 1929-12-14 1929-12-14 Improvements in sound producing devices

Publications (1)

Publication Number Publication Date
GB345326A true GB345326A (en) 1931-03-16

Family

ID=10403005

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3836729A Expired GB345326A (en) 1929-12-14 1929-12-14 Improvements in sound producing devices

Country Status (1)

Country Link
GB (1) GB345326A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003001503A1 (en) * 2001-06-25 2003-01-03 Siemens Aktiengesellschaft Device and method for parametrically generating sound, and a device and method for demodulating amplitude-modulated sound

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003001503A1 (en) * 2001-06-25 2003-01-03 Siemens Aktiengesellschaft Device and method for parametrically generating sound, and a device and method for demodulating amplitude-modulated sound

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