Ear trumpet download
Author: c | 2025-04-24
Milk Creek Tin Ear Trumpet (Ear Horn) Reproduction. The Milk Creek tin ear trumpet is not a genuine antique ear trumpet, but rather, is a reproduction of what an ear trumpet from the civil
Ear Trumpet Photos, Download The BEST Free Ear Trumpet
Of the shell and having the'open end 0 the sound-conducting tube arranged toreceive the sound-waves deflected by the crown portion of the shell, substantially as set fort I CHRlSTOPHER W. LEV ALLEY. W itnesses 'WM. 0. Farm, VLAs'rA I. KLOFANDA. US27899805A 1905-09-18 1905-09-18 Ear-trumpet. Expired - Lifetime US827645A (en) Priority Applications (1) Application Number Priority Date Filing Date Title US27899805A US827645A (en) 1905-09-18 1905-09-18 Ear-trumpet. Applications Claiming Priority (1) Application Number Priority Date Filing Date Title US27899805A US827645A (en) 1905-09-18 1905-09-18 Ear-trumpet. Publications (1) Publication Number Publication Date US827645A true US827645A (en) 1906-07-31 Family ID=2896125 Family Applications (1) Application Number Title Priority Date Filing Date US27899805A Expired - Lifetime US827645A (en) 1905-09-18 1905-09-18 Ear-trumpet. Country Status (1) Country Link US (1) US827645A (en) 1905 1905-09-18 US US27899805A patent/US827645A/en not_active Expired - Lifetime Similar Documents Publication Publication Date Title US2804932A (en) 1957-09-03 Hearing aid US3676611A (en) 1972-07-11 Earpiece for hearing aid having sound inlet for high frequencies US1556775A (en) 1925-10-13 Audiphone US827645A (en) 1906-07-31 Ear-trumpet. US4273021A (en) 1981-06-16 Mutes for wind instruments US2244205A (en) 1941-06-03 Mute US1045812A (en) 1912-12-03 Artificial ear-drum. US2229322A (en) 1941-01-21 Whistle US1884638A (en) 1932-10-25 Hearing device US2118993A (en) 1938-05-31 Transmitter US2110908A (en) 1938-03-15 Means for damping acoustic apparatus US867836A (en) 1907-10-08 Trumpet or horn of sound-reproducing instruments. US962574A (en) 1910-06-28 Sound-horn. US860906A (en) 1907-07-23 Stethoscope. US853148A (en) 1907-05-07 Horn. US807714A (en) 1905-12-19 Piano attachment. US2020261A (en) 1935-11-05 Reed musical instrument US793436A (en) 1905-06-27 Earpiece or acoustic device. US1578336A (en) 1926-03-30 Sound-transmitting instrument US585003A (en) 1897-06-22 Histle-drum US1770234A (en) 1930-07-08 Apparatus for reproducing sound US1644795A (en) 1927-10-11 Sound amplifier US892672A (en) 1908-07-07 Mouth-organ. US1782801A (en) 1930-11-25 Radio loud-speaker US2823571A (en) 1958-02-18 Musical instrument Held therein by friction and is provided with a handle f. the 0 en end a of the shell is preferably provide with a foraminous screen, such as IOO is usually employed in instruments of this character.- An ear-trumpet having its opposite ends open for the direct entrance of soundwaves, and a conductin tube opening in the interior of the shell an arran ed to receive the sound-waves entering bot ends of the shell, substantially as set forth. An ear-trumpet comprising a shell having one end open and the opposite end shaped to deflect thesound-waves entering the open end and having the deflecting end also open to permit the direct entrance of sound-waves, and a conducting-tube having its open end arranged opposite to the deflecting end of the shell, substantially as set forth. An ear-trumpet comprising a shell having one end 0 en and its opposite end formed into a defiect1ng-crown, the crown end of the shell being also open for the direct passage of sound waves, and a sound-condncting tube extending into the shell and having its open end. arranged posite to the deflectingcrown of the shel and also the opening in the crown end thereof, substantially asset forth. An ear-truinpet comprising a shell, a sound--conducting tube extending into the interior of the shell, and an open reentraxit tube leading ihom'one end of the shell into the said sound-conducting tube, substantially as set forth. An ear-trumpet comprising a shell having one end open and its opposite end formed into a defiec'ting-crovm,a reentr-ant 0 en- Waves entering through either end of the shell, and a stopper for closing one of the said openings, substantially as set forth. an ear-trumpet comprising a shell having one end open and its opposite end formed into a sound-defiectin' crownv an open rentrant tube connecte with said crown, a sound-conducting tube extending into the shell and having its inner open en arranged to receive the sound-waves deflected by the crown portion of the shell and those entering through the rentrant tube, and a stopper arranged to close the reentrant tube, substantially as set forth. An ear-trumpet comprising a shell open at one end and having its oppositeend formed to produce a sound-deflecting crown, an open rentrant tube connected with the said crown end of the shell and extending thereinto, a sound-conductin tube the inner end of which enters the shel and is arranged to receiveThe Ear Trumpet. For over 200 years, the Ear Trumpet was
US827645A - Ear-trumpet. - Google Patents Ear-trumpet. Download PDF Info Publication number US827645A US827645A US27899805A US1905278998A US827645A US 827645 A US827645 A US 827645A US 27899805 A US27899805 A US 27899805A US 1905278998 A US1905278998 A US 1905278998A US 827645 A US827645 A US 827645A Authority US United States Prior art keywords shell tube sound ear open Prior art date 1905-09-18 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 - Lifetime Application number US27899805A Inventor Christopher W Levalley 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.) 1905-09-18 Filing date 1905-09-18 Publication date 1906-07-31 1905-09-18 Application filed by Individual filed Critical Individual 1905-09-18 Priority to US27899805A priority Critical patent/US827645A/en 1906-07-31 Application granted granted Critical 1906-07-31 Publication of US827645A publication Critical patent/US827645A/en 1923-07-31 Anticipated expiration legal-status Critical Status Expired - Lifetime legal-status Critical Current Links USPTO USPTO PatentCenter USPTO Assignment Espacenet Global Dossier Discuss Images Classifications A—HUMAN NECESSITIES A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS A61F11/00—Methods or devices for treatment of the ears or hearing sense; Non-electric hearing aids; Methods or devices for enabling ear patients to achieve auditory perception through physiological senses other than hearing sense; Protective devices for the ears, carried on the body or in the hand A61F11/30—Non-electric hearing aids, e.g. ear trumpets, sound amplifiers or ear-shells Definitions Fig; 4 is a side view of the stopper removed. Fig. 5 is a plan view ofthe same, and Fig. 6 is a view in elevation of the two parts of the stopper separated. the ear-trumpet to which I have applied my 1m rovements is in its general construc-" tion 0 a type well known. It consists of a sound-receiving shell A of bell shape and a conducting-tube B,. Milk Creek Tin Ear Trumpet (Ear Horn) Reproduction. The Milk Creek tin ear trumpet is not a genuine antique ear trumpet, but rather, is a reproduction of what an ear trumpet from the civil Download Ear Trumpet - Gallucci MP3 song on Boomplay and listen Ear Trumpet - Gallucci offline with lyrics. Ear Trumpet - Gallucci MP3 song from the Gallucci’s album You-Wrecker is released in 2025.Ear Trumpet Photos, Download The BEST Free Ear Trumpet Stock
Tuning a trumpet is an essential skill for any trumpet player, whether you’re a beginner or a professional. Proper tuning ensures that your instrument is in harmony with other instruments in an ensemble or band. It also helps you produce a clear and consistent sound. In this article, we will provide you with step-by-step instructions on how to tune a trumpet.The first step in tuning a trumpet is to make sure that your instrument is in good condition. Check for any leaks or damages in the valves, slides, and mouthpiece. Once you have ensured that your trumpet is in good condition, you can proceed to tune it. There are several methods to tune a trumpet, but the most common method is using a tuning device or a piano.In the next section, we will provide you with detailed instructions on how to use a tuning device or a piano to tune your trumpet. We will also discuss the importance of ear training and how to develop your ear to recognize when your trumpet is out of tune. By the end of this article, you will have a better understanding of how to tune a trumpet and be able to produce a clear and harmonious sound.Understanding Your TrumpetParts of a TrumpetTo understand how to tune a trumpet, it’s important to first understand the different parts of the instrument. Here are the main parts of a trumpet:PartDescriptionMouthpieceThe part of the trumpet that the player blows into.LeadpipeThe tube that connects the mouthpiece to the Both the sound-waves that are defiectedby thecrown and those that enter through the reentrant tube, and a stopper for the reentrant tube comprisin a plug F and a cone G attached thereto, su stantially as set forth. An ear-trumpet comprising a shell having an open receiving end for the soundwaves and the opposite end shaped to deflect the sound-Waves and a closed reentrant shell passing into a sound-conducting tube to conduct the sound-waves to the ear, substan-' tially as set forth. An ear-trumpet comprising a shell having one end open and its opposite end formed into a deflecting-crown; a reentrant art'attached to the crown end of the shel and a sound-conducting tube extending into the shell, its inner portion surrounding and being substantially concentric with the said re'e'ntrant part of the shell and having the'open end 0 the sound-conducting tube arranged toreceive the sound-waves deflected by the crown portion of the shell, substantially as set fort I CHRlSTOPHER W. LEV ALLEY. W itnesses 'WM. 0. Farm, Landscapes Health & Medical Sciences (AREA) Life Sciences & Earth Sciences (AREA) Biomedical Technology (AREA) Acoustics & Sound (AREA) Biophysics (AREA) Otolaryngology (AREA) Psychology (AREA) Engineering & Computer Science (AREA) Physics & Mathematics (AREA) Heart & Thoracic Surgery (AREA) Vascular Medicine (AREA) Animal Behavior & Ethology (AREA) General Health & Medical Sciences (AREA) Public Health (AREA) Veterinary Medicine (AREA) Orthopedics, Nursing, And Contraception (AREA) Description PATENTED JULY 31, 1906. 0. W. LEVALLEY. EAR TRUMPET. APPLICATION FILED SEPT. 18. mos. Quezon: cal ' and UNITED S AT S PATENT OFFICE. CHRISTOPHER W. LEVALLEY, F MILWAUKEE, WISCONSIN. ' i EAR-TRUMPET. To all whom it may concern: Be it known that I, CHRISTOPHER W. LE- VALLEY, a citizen of the United States, residing at Milwaukee, in the countyof Milwaukee, Wisconsin, have invented a new and use-- reentrant tube of the instrument having inserted therein a stopper. Fig; 4 is a side view of the stopper removed. Fig. 5 is a plan view ofthe same, and Fig. 6 is a view in elevation of the two parts of the stopper separated. The ear-trumpet to which I have applied my 1m rovements is in its general construc-" tion 0 a type well known. It consists of a sound-receiving shell A of bell shape and a conducting-tube B, leading from the shell rovided at its end with an ear-tip b. The aring end of the shell is left open'to receiveEar Trumpet 1.3.2 - Download
A shell having one end 0 en and its opposite end formed into a defiect1ng-crown, the crown end of the shell being also open for the direct passage of sound waves, and a sound-condncting tube extending into the shell and having its open end. arranged posite to the deflectingcrown of the shel and also the opening in the crown end thereof, substantially asset forth. 4. An ear-truinpet comprising a shell, a sound--conducting tube extending into the interior of the shell, and an open reentraxit tube leading ihom'one end of the shell into the said sound-conducting tube, substantially as set forth. 5. An ear-trumpet comprising a shell having one end open and its opposite end formed into a defiec'ting-crovm,a reentr-ant 0 en- Waves entering through either end of the shell, and a stopper for closing one of the said openings, substantially as set forth. 7. In an ear-trumpet comprising a shell having one end open and its opposite end formed into a sound-defiectin' crownv an open rentrant tube connecte with said crown, a sound-conducting tube extending into the shell and having its inner open en arranged to receive the sound-waves deflected by the crown portion of the shell and those entering through the rentrant tube, and a stopper arranged to close the reentrant tube, substantially as set forth. 8. An ear-trumpet comprising a shell open at one end and having its oppositeend formed to produce a sound-deflecting crown, an open rentrant tube connected with the said crown end of the shell and extending thereinto, a sound-conductin tube the inner end of which enters the shel and is arranged to receive both the sound-waves that are defiectedby thecrown and those that enter through the reentrant tube, and a stopper for the reentrant tube comprisin a plug F and a cone G attached thereto, su stantially as set forth. 9. An ear-trumpet comprising a shell having an open receiving end for the soundwaves and the opposite end shaped to deflect the sound-Waves and a closed reentrant shell passing into a sound-conducting tube to conduct the sound-waves to the ear, substan-' tially as set forth. 10. An ear-trumpet comprising a shell having one end open and its opposite end formed into a deflecting-crown; a reentrant art'attached to the crown end of the shel and a sound-conducting tube extending into the shell, its inner portion surrounding and being substantially concentric with the said re'e'ntrant partEar trumpet Icons - Download 86 Free Ear trumpet icons here
🎵 Master Trumpet Tuner: Tune Your Trumpet with Precision! 🎵Master Trumpet Tuner is an easy-to-use application that will help you tune your trumpet quickly and accurately. Whether you are a professional musician or a beginner, this app is designed to meet all your tuning needs. With sets of sounds tailored for different types of trumpets, Master Trumpet Tuner ensures you achieve perfect tuning every time. This Simple Trumpet Tuner is the ideal Instrument Tuner for all your needs, and our Trumpet Tuner Offline mode guarantees you can tune anywhere.🎵 Discover Fantastic Features: 🎵✅ Recordings of Real Trumpet Sounds: Experience authentic trumpet tones for precise tuning. ✅ Two Modes: Pitchfork & Tuner: Choose between manual and automatic tuning options. ✅ Set Different Sound Names: Customize your tuning with American, European, and solmization naming conventions. ✅ Various Trumpet Tuning Sets: Includes standard Trumpet Bb and all types of trumpet tunings. ✅ Adjustable Sound Frequency: Set the frequency of the "a" note (concert pitch) in Hz for personalized tuning. ✅ Deviation Measurement: Determine the deviation from the base frequency in cents for precise tuning adjustments. 🔊 Tuning Modes 🔊Pitchfork Mode: Use the pitchfork mode to tune your trumpet by ear. Play the trumpet sound for each tuning set and ensure your instrument is tuned properly. You can also automatically play all sounds from the lowest to the highest pitch, making it easy to tune during rehearsals. Tuner Mode: For those who need a bit more assistance, the auto tuner mode is perfect. Simply. Milk Creek Tin Ear Trumpet (Ear Horn) Reproduction. The Milk Creek tin ear trumpet is not a genuine antique ear trumpet, but rather, is a reproduction of what an ear trumpet from the civil Download Ear Trumpet - Gallucci MP3 song on Boomplay and listen Ear Trumpet - Gallucci offline with lyrics. Ear Trumpet - Gallucci MP3 song from the Gallucci’s album You-Wrecker is released in 2025.Ear Trumpet v2.2.2.0
Such sound a much purer and more natural tone than that resultin from the use of the ordinary ear-trurnpet iaving an opening at the front only. - It is a well-known fact that deaf persons can hear better under, certain conditions than others and that the acuteness of their hearing'varies'at different times. I therefore provide the instrument which I have described with a stop er that is arranged to close the tube D, sue a stopper being represented detached in'Fig. 4 an lace in the instrument in Fig. 3. This enab es theuser of the hearing instrument such as I have described to largely adapt it "to the circumstances under which it is used. Forinstance, for ordinary conversation where the person conversin with the user of the instrument is in front 0 him it might be desirable to employ the stopper in order that disturbing sounds coming from other directions than that of the converser should be very largely cut off. .On theother hand, for concerts, especially those taking place in a closed hall, thebetter effect is experienced with the stopper removed. The stopperis preferably of the shape and constructlon indicated in the drawings. It consists of a plug or stopperv proper, F, ada ted to fit closely within the outer end of t e tube D. It is preferabl held therein by friction and is provided with a handle f. I prefer to combine with the. stopper a coneG, adapted to extend into the tube'D to fit by friction over the shouldered en .9 of I The 0 en end a of the shell is preferably provide with a foraminous screen, such as IOO is usually employed in instruments of this character.- Having described my invention, what I claim, and desire to secure by Letters Patent, is 1. An ear-trumpet having its opposite ends open for the direct entrance of soundwaves, and a conductin tube opening in the interior of the shell an arran ed to receive the sound-waves entering bot ends of the shell, substantially as set forth. 2. An ear-trumpet comprising a shell having one end open and the opposite end shaped to deflect thesound-waves entering the open end and having the deflecting end also open to permit the direct entrance of sound-waves, and a conducting-tube having its open end arranged opposite to the deflecting end of the shell, substantially as set forth. 3. An ear-trumpet comprisingComments
Of the shell and having the'open end 0 the sound-conducting tube arranged toreceive the sound-waves deflected by the crown portion of the shell, substantially as set fort I CHRlSTOPHER W. LEV ALLEY. W itnesses 'WM. 0. Farm, VLAs'rA I. KLOFANDA. US27899805A 1905-09-18 1905-09-18 Ear-trumpet. Expired - Lifetime US827645A (en) Priority Applications (1) Application Number Priority Date Filing Date Title US27899805A US827645A (en) 1905-09-18 1905-09-18 Ear-trumpet. Applications Claiming Priority (1) Application Number Priority Date Filing Date Title US27899805A US827645A (en) 1905-09-18 1905-09-18 Ear-trumpet. Publications (1) Publication Number Publication Date US827645A true US827645A (en) 1906-07-31 Family ID=2896125 Family Applications (1) Application Number Title Priority Date Filing Date US27899805A Expired - Lifetime US827645A (en) 1905-09-18 1905-09-18 Ear-trumpet. Country Status (1) Country Link US (1) US827645A (en) 1905 1905-09-18 US US27899805A patent/US827645A/en not_active Expired - Lifetime Similar Documents Publication Publication Date Title US2804932A (en) 1957-09-03 Hearing aid US3676611A (en) 1972-07-11 Earpiece for hearing aid having sound inlet for high frequencies US1556775A (en) 1925-10-13 Audiphone US827645A (en) 1906-07-31 Ear-trumpet. US4273021A (en) 1981-06-16 Mutes for wind instruments US2244205A (en) 1941-06-03 Mute US1045812A (en) 1912-12-03 Artificial ear-drum. US2229322A (en) 1941-01-21 Whistle US1884638A (en) 1932-10-25 Hearing device US2118993A (en) 1938-05-31 Transmitter US2110908A (en) 1938-03-15 Means for damping acoustic apparatus US867836A (en) 1907-10-08 Trumpet or horn of sound-reproducing instruments. US962574A (en) 1910-06-28 Sound-horn. US860906A (en) 1907-07-23 Stethoscope. US853148A (en) 1907-05-07 Horn. US807714A (en) 1905-12-19 Piano attachment. US2020261A (en) 1935-11-05 Reed musical instrument US793436A (en) 1905-06-27 Earpiece or acoustic device. US1578336A (en) 1926-03-30 Sound-transmitting instrument US585003A (en) 1897-06-22 Histle-drum US1770234A (en) 1930-07-08 Apparatus for reproducing sound US1644795A (en) 1927-10-11 Sound amplifier US892672A (en) 1908-07-07 Mouth-organ. US1782801A (en) 1930-11-25 Radio loud-speaker US2823571A (en) 1958-02-18 Musical instrument
2025-04-18Held therein by friction and is provided with a handle f. the 0 en end a of the shell is preferably provide with a foraminous screen, such as IOO is usually employed in instruments of this character.- An ear-trumpet having its opposite ends open for the direct entrance of soundwaves, and a conductin tube opening in the interior of the shell an arran ed to receive the sound-waves entering bot ends of the shell, substantially as set forth. An ear-trumpet comprising a shell having one end open and the opposite end shaped to deflect thesound-waves entering the open end and having the deflecting end also open to permit the direct entrance of sound-waves, and a conducting-tube having its open end arranged opposite to the deflecting end of the shell, substantially as set forth. An ear-trumpet comprising a shell having one end 0 en and its opposite end formed into a defiect1ng-crown, the crown end of the shell being also open for the direct passage of sound waves, and a sound-condncting tube extending into the shell and having its open end. arranged posite to the deflectingcrown of the shel and also the opening in the crown end thereof, substantially asset forth. An ear-truinpet comprising a shell, a sound--conducting tube extending into the interior of the shell, and an open reentraxit tube leading ihom'one end of the shell into the said sound-conducting tube, substantially as set forth. An ear-trumpet comprising a shell having one end open and its opposite end formed into a defiec'ting-crovm,a reentr-ant 0 en- Waves entering through either end of the shell, and a stopper for closing one of the said openings, substantially as set forth. an ear-trumpet comprising a shell having one end open and its opposite end formed into a sound-defiectin' crownv an open rentrant tube connecte with said crown, a sound-conducting tube extending into the shell and having its inner open en arranged to receive the sound-waves deflected by the crown portion of the shell and those entering through the rentrant tube, and a stopper arranged to close the reentrant tube, substantially as set forth. An ear-trumpet comprising a shell open at one end and having its oppositeend formed to produce a sound-deflecting crown, an open rentrant tube connected with the said crown end of the shell and extending thereinto, a sound-conductin tube the inner end of which enters the shel and is arranged to receive
2025-04-22US827645A - Ear-trumpet. - Google Patents Ear-trumpet. Download PDF Info Publication number US827645A US827645A US27899805A US1905278998A US827645A US 827645 A US827645 A US 827645A US 27899805 A US27899805 A US 27899805A US 1905278998 A US1905278998 A US 1905278998A US 827645 A US827645 A US 827645A Authority US United States Prior art keywords shell tube sound ear open Prior art date 1905-09-18 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 - Lifetime Application number US27899805A Inventor Christopher W Levalley 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.) 1905-09-18 Filing date 1905-09-18 Publication date 1906-07-31 1905-09-18 Application filed by Individual filed Critical Individual 1905-09-18 Priority to US27899805A priority Critical patent/US827645A/en 1906-07-31 Application granted granted Critical 1906-07-31 Publication of US827645A publication Critical patent/US827645A/en 1923-07-31 Anticipated expiration legal-status Critical Status Expired - Lifetime legal-status Critical Current Links USPTO USPTO PatentCenter USPTO Assignment Espacenet Global Dossier Discuss Images Classifications A—HUMAN NECESSITIES A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS A61F11/00—Methods or devices for treatment of the ears or hearing sense; Non-electric hearing aids; Methods or devices for enabling ear patients to achieve auditory perception through physiological senses other than hearing sense; Protective devices for the ears, carried on the body or in the hand A61F11/30—Non-electric hearing aids, e.g. ear trumpets, sound amplifiers or ear-shells Definitions Fig; 4 is a side view of the stopper removed. Fig. 5 is a plan view ofthe same, and Fig. 6 is a view in elevation of the two parts of the stopper separated. the ear-trumpet to which I have applied my 1m rovements is in its general construc-" tion 0 a type well known. It consists of a sound-receiving shell A of bell shape and a conducting-tube B,
2025-04-16