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
GB1687427A
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Individual
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Individual
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Publication date
Application filed by IndividualfiledCriticalIndividual
Priority to GB1687427ApriorityCriticalpatent/GB283796A/en
Publication of GB283796ApublicationCriticalpatent/GB283796A/en
283,796. Frenkel, R. June 24, 1927. Sound magnifying and directing appliances; speaking trumpets. - A sound amplifier of the kind resembling the human vocal organs comprises a straight conical sound aim b, a domed chamber c forming an extension of the arm b and corresponding to the pharyngeal cavity, and a lateral chamber f leading out from the arm b and corresponding to the mouth cavity. Depending vibrating tongues d corresponding to the uvula, may be provided between the chamber, c, f. The sound producing diaphragm a is near the end of the arm b. The device may be used as a speaking trumpet.
GB1687427A1927-06-241927-06-24Improvements in or relating to sound amplifiers for soundreproducing apparatus
ExpiredGB283796A
(en)
Improvements in or relating to horns, trumpets and like acoustic amplifiers, suitable for loud speaking telephonic receivers and other sound producing or reproducing apparatus