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GB209555A - Improvements in spiral sound amplifiers - Google Patents

Improvements in spiral sound amplifiers

Info

Publication number
GB209555A
GB209555A GB3182122A GB3182122A GB209555A GB 209555 A GB209555 A GB 209555A GB 3182122 A GB3182122 A GB 3182122A GB 3182122 A GB3182122 A GB 3182122A GB 209555 A GB209555 A GB 209555A
Authority
GB
United Kingdom
Prior art keywords
inlet openings
convolution
box
sound amplifiers
spiral 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
GB3182122A
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 GB3182122A priority Critical patent/GB209555A/en
Publication of GB209555A publication Critical patent/GB209555A/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
    • G10K13/00—Cones, diaphragms, or the like, for emitting or receiving sound in general

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Catching Or Destruction (AREA)

Abstract

209,555. Donnell, L. H. Nov. 21, 1922. Sound-magnifying appliances. - A soundamplifier comprises a rectangular wooden box having oppositely disposed inlet openings 3 and a convolute passage preferably formed from a strip of flat metal 4 the open ends of the smallest convolution being disposed opposite the inlet openings whereby the sound waves travel from the innermost convolution and are discharged through the aperture 2. Fig. 3 shows the metal spiral secured by being embedded in the side walls of the box.
GB3182122A 1922-11-21 1922-11-21 Improvements in spiral sound amplifiers Expired GB209555A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3182122A GB209555A (en) 1922-11-21 1922-11-21 Improvements in spiral sound amplifiers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3182122A GB209555A (en) 1922-11-21 1922-11-21 Improvements in spiral sound amplifiers

Publications (1)

Publication Number Publication Date
GB209555A true GB209555A (en) 1924-01-17

Family

ID=10328908

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3182122A Expired GB209555A (en) 1922-11-21 1922-11-21 Improvements in spiral sound amplifiers

Country Status (1)

Country Link
GB (1) GB209555A (en)

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