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
GB2820221A
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.)
CHARLES HENRY ST JOHN COOPER
Original Assignee
CHARLES HENRY ST JOHN COOPER
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 CHARLES HENRY ST JOHN COOPERfiledCriticalCHARLES HENRY ST JOHN COOPER
Priority to GB2820221ApriorityCriticalpatent/GB191506A/en
Publication of GB191506ApublicationCriticalpatent/GB191506A/en
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)
Obtaining Desirable Characteristics In Audible-Bandwidth Transducers
(AREA)
Abstract
191,506. Cooper, C. H. St. J. Oct. 24, 1921. Sound magnifying and directing appliances.-A cabinet gramophone contains a horn d within an outer horn d<1>. The inner horn is supported solely by a block e fixed to the back of the cabinet. The sides f<1> of the mouth of the outer horn are flat, as shown in Fig. 2, or are curved to correspond to the curved sides g of the inner horn. A sliding sound detector h is provided above the mouth of the horns.
GB2820221A1921-10-241921-10-24Improvements in or relating to cabinet gramophones
ExpiredGB191506A
(en)