US1663989A - Phonograph sound amplifier - Google Patents

Description

March 27, 1928.

C. A. LINTON PHONDGRAPH SOUND AMPLIFIER Filed Nov. 16, 1920 4 Sheets-Sheet 1 INVEN TOR.

hw' ATTORNEY.

March 27, 19280 c. A. LINTON PHONOGRAPH sounn AMPLIFIER 1920 4 Sheets-Sheet 2 Filed Nov. 16

#w ATTORNEY.

a INVENTOR.

WITNESS.-

March 27, 1928.

4 Sheets-Sheet 5 C. A. LINTON PHONOGRAPH SOUND AMPLIFIER Filed Novv '16, 1920 W] TNESS: "W

INVENTOP. Q%% @6205 BY -M ATTORNEY.

INVENTOR C. A LHNTON PHONOGRAPH SOUND AMPLIFIER Filed Nov. 16, 192G 4 Sheets-Sheet 4 March 27, I928.

WITNESS.-

. w ATTORNEY.

Patented Mar. 27, 1928.

PATENT OFFICE.

CHESTER ALFRED LINTON, OF KANSAS CITY, MISSOURI.

PHONOGRAPH SOUND AMPLIFIER.

Application filed November 16, 1920. Serial No. 424,347.

My invention relates to phonograph sound amplifiers although its novelty is not limited to this field of acoustics and particularly to raised means for adapting resonance to 5 attain desired resonancethrough sound am plifie rs having resilient walls.

One of the objects of my invention is to produce an amplifier or resonator particularly adapted for use with'sound reprduc ing machines, which will utilize the energy ofresonant frequencies excited by such machines.

Another object of my invention is to provide an amplifyingdevice for recording or device and which will add greater mellowness and naturalness to the sounds. Another object of my invention is to provide an amplified, by means of which the audible sounds will be delivered more 'in accord with the original scands than has been possible by any other construction prior to my invention.

One object of my invention is to provide a novel method and apparatus for transmitting sound impulses to an acoustic device adapted to function like a sound-board.

Another object of my invention is to provide improvements in a sound amplifyin device, or acoustical apparatus, for recor ing or reproducing sound, by means of which the quality and genuineness of the sounds passing within will be recorded or delivered with marvelous accuracy and practically. like the original sounds in all respects.

Further objects of my invention are to provide, improvements in an amplifier or acoustic device, by means of which new fre- 1o qucncies will be produced from and directed to certain predetermined or desiredplaces or areas on said amplifier or acoustic device; to provide improvements in an amplifier, by means of' which sound vibrations will be transmitted to and blended with other sounds passing within said amplifier; to provide improvements in an amplifier, by means of which sonorous waves are reinforced and amplified near themouth of said amplifier; to provide improvements in an amplifier that are of simple and durable construction; to provide an amplifier best adapted for commercial purposes.

,(Tom-erning one view of the broad aspect of this invention and referring now to shown constructions, a difference between a sound reproducing sound, which will transmit new: over-tones to the sounds passlng within sa d amplifier of this species and an ordinary amplifier that uses merely an air passage consists in having separate outer members spaced upon the passage or resonant walls of the former, along with the idea that the separate outer members must be capable of vibratmg. of conducting vibrations, and, as an add tional object and further ex anding this view and showing further di erence, that their mass and elastic force must be distributed and that this distribution must be carried out in accordance with the forms of the vibrations that the amplifier is desired to execute is a novel idea of the present invention.

One of the several basic ideas original with this invention is to provide an amplifying devlce adapted to take into consideration the free period or natural frequency of bodies that may be at resonance in individual harmony with the rythmic flow of sound vibrations, and the idea that such bodies must be raised and may be exteriorly secured to the chamber to balance or, in other words, evenly distribute the progressive sound vibrations that may be excited or forced through such chamber and bodies. One feature of this idea is to provide sympathetic vibration in abutting spaced separate bodies that will balance in an opposed relation by means of free vibration the vibration of the walls of the sound amplifier. Thus it is possible, 'for instance, to have in one form of device in which there appears a fairly uniform well balanced variation of the natural rates of vibration of soundingboards or resonant walls from the lower register to a high register within the desired audible acoustic range of frequencies. With such an arrangement the number and extent of balancing means may be employed as is required and the points of placement or the loeations may be varied, so that sounds coming, from the preferred embodiment of such means do away with hollow effects and are about double or treble in volume that coming from an ordinary honograph.

By the provision of a su eient number of resonant members'each pair having a different natural rate of vibration or response frequency, the sounding-board will have periods of resonance in sympathy with the various fundamental tones and their overtones, so that the performance of the sounding-board will not correspond with the actual recorded frequencies which are to be reproduced, and

therefore it is seen that, in one aspect of this invention, I may provide for as large anumber of members having natural rates of vibration within the ran e of voice and music frequencies as s possl le or desirable and obtain the effects described.

These and other objects will more fully appear in the following specification and accompaying drawings, considered together or separately. I

In the accompanying drawings,-

Fig. l is a top view of my wooden arn plifier with increased cross sectional perimeter, provided with a plurality of my sound conveyors or sound-boards preferably solid which hang outwardly through air space. I

Fig. 2 is a side elevation of the same, showing forward ends of fibrous conveyors 10 secured where the wall is great in width or of decided diderent frequency as compared to the restricted portion of the amplifier. 1

Fig. 3 is a rear elevation of Fig. 2, showing a fence-like sound-board structure, with openair spaces. v

Fig. t 'isa longitudinal vertical sectional view of my im roved restricted portion and sounding-cham or portion, without any members to excite sound showing.

Fig. 5 is a top view of the resonant bars or restricted orti n and sounding-chamber portion, showing by broken lines the thickness of graduated walls.

Fig. 6 is a front elevation of the amplifier, looking into the large end thereof, showing curved side walls of the sounding-chamber portion and restricted portion.

Fig. 7 is a top view of a resilient amplifier provided with in invention, a preiered modification, showing individual suspension bars or rods or sound vibration conducting members in this instance relevant means of a predetermined or desired len h, width and thiclrness and preferably of predetermined or desired volume, elasticity and density, and showing the minor and major length or portions-oi said members.

Fi 8 is a rear elevation of Fig. 7, showing t e advanced positions of my individual resonant bars or sound conducting members on the restricted portion, on opposite sides thereof.

Fig. 9 is a top view of another modification, showing elevated angular resonant sound conve ors or sound-boards having branches at orward ends.

Fi 10 is a top view of still" another modifem, showing the length of sound conveyors as compared to the distance along the walls of the amplifier between their respective ends, and showing a centrally placed conveyor having branches at both its ends.

Fig. ll is a sideelevation of the form shown in Fig. 10, showing a unilateral sound neonate cogveyor having branches-at its posterior en To illustrate my invention, I annex hereto four sheets of drawings, in which similar reference characters are used to designate similar parts in the difierent views. The drawings are not in scale and are notdrawn to size in any of the views, which assist ,to

illustrate some of the 'many practical ar exit end. The sounding-boards of the sounding chamber portion 1 are in this instance carved out internally, and one pair of these boards may be concave in shape and diverge from the common longitudinal axis in the form of oppositely opposed curves and may be under tension. The other two ofthese boards are preferably of unequal area, the

upper the longest. All four of these boards combine to form an integral tube with outlets of dilferent size. The inner and outer ends of these four boards respectively combine to form symmetrical openings. The restricted portion of the amplifier here shown is provided with substantially annular walls with outer orifice having in this instance a plurality of wooden-ring sections disposed end to end to provide a continuous passage for sound and connected to each other to form a turn or reverse curve and respectively designated by the numerals 2, 3, 4, 5, 6 and 7. The ring sections are of diflerent pattern and each section is constructed so that the rain of the wood runs longitudinally wit respect tothe sound conducting passage of the restricted portion. The inner end of the sounding-chamber portion 1 is shaped to conform with the adjacent end of the ring section 7. To provide an uninterrupted passage for sound the restricted portion is preferably connected to the adjacent end of the soundingchamber portion 1, preferably by gluing or cementing. The ring sections are connected to each other in this instance in similar manner. The ring sections may each be formed as an intcgral whole of any suitable material.

So as to obtain certain desired results or certain special results, I may provide coating or covering material of a species.possessing novel characteristics, like asphaltum, certain of these characteristics being more important than others. However, in numerous forms of my invention special coating material,

may be employed as an excellent protecting agent of the surface of the amplifier on which it is adapted to be applied,'thus capableof preserving resonance in the acoustic device on damp days. Asphaltum does not reflect glaring rays of light, and thus if used as a coating on the device, and if the device be exposed to view, it may afford a relief to the eyes of alistener or spectator.

or serve other useful purposes not a part of this specification. The drying qualities,

or dryness factor,the tenacity and durability of asphaltum are desirablelif used in relation to the passage shown. The thicker asphaltum may be applied over a flexible coating in the passage of the amplifier the more 1t may serve to cushlon the sounds progressing through the amplifier passage. Asphaltum may function as a sort of shell to prevent the appearance of needle-like points of sound in the desired vibration. The asphaltum coating is superior to varnish of the finest grade in many of its features, and it is understood that I may apply asphaltum straight or as a base of coating as its properties are .more readilyapplicable when made thin or when used with other substances. And I do not want to be restricted, in any sense, to the application of this coating of novel type.

The inner and outer walls of the restricted portion and sounding-chamber portion may be provided with two coatings of varnish. A coating of asphaltum or the like may be placed upon the varnish coatings on one or more surfaces, in this instance the inner surface of the restricted portion and on the inner surface of the sounding-chamber portion. Preferably, the asphaltum coatings are pumicated or sanded or roughened to remove the glazed surface for producing the best results.

As a .readily apparent illustration of a short,method of utilizing the principle I have discovered, a sound conducting member, which may be a plane member, preferably composed of wood or other good resonant material and designated by 8 in Figs. 1 and 2, is secured at its ends only like an elevated bridge to the restricted portion and the sounding-chamber portion at places in this instance between the ends of the restricted portion and between the ends of the sounding-chamber portion. This straight member 8 may be directly connected and may be, if desired of less cross sectional dimensions of the restricted portion. Each sound conducting member 9 is provided with a set of bridge-like structures or arms 10, in this instance being oblique, the forward ends of which are secured to the sounding-chamber portion 1 at places toward the ends of-the lattcrjor relative to the frequencies of the walls of the sounding chamber. Each memberit) is also secured to a set of hanging bridge-like structures or arms 11, and these two sets are connected at spaced apart places to opposite sides of the restricted portion respectively. Each set of branches or arms 10 is preferably connected to the adjacent side of the sounding-chamber portion 1, to the sounding-board or wall surface thereof. As shown in Fig. 3 this or similar structure may be provided, in one form, with miter joints. j

In Figs. 7 and 8,.is illustrated a preferred modification in which two crooked substantially external sets of individual bars or of the walls of the restricted portion, and, in 1 this instance, relative to each other. The anterior ends of the two sets of in this instance solid memberse12 are respectively connected to advanced places on sides of the sounding-chamber portion 1 relative to the inner end thereof and relative to the frequenciesthereof. The posterior and anterior end'of each individual sound conducting member 12 is preferably connected to adjacent contiguous sides of the amplifier. Said individual members 12 are preferably distributed on opposite sides of the sound amplifier or acoustical apparatus. Said members 12 are in this instance oblique and largely homogeneous and secured in this instance tangentially flush to the soundingchamber portion 1 to the spaced soundingboards thereof.

As may be seen, the resonant members 12 may be proportioned directly by and to the natural frequency capacity of the amplifier or acoustic device to respond to frequencies over the range of voice or music frequencies. The sizes or lengths of members similar to 12 may also be determined by the spaces to be occupied between the locations, or, in

means shown, for in ordinary practice in approximation of conditions may be 1n ac in Fig. 9 is provided with two or a plurality,

of elevated bars or arcuate sound conducting members 13 respectively secured at their posterior ends to opposite'sides of in this instance, the restricted portion. The anterior ends of the members 13-a1'e provided with suitable resilient branches or arms 14 and 15 secured at spaced apart places to the adjacent sides of the sounding-chamber portion 1 or sounding-boards thereof, or thin resilient parts thereof.

In the form shown in Figs. 10 and 11 there are provided by way of example two or a plurality of sound vibration conveying memhere 16, supported convergingly of raised bridge-like structure, the anterior ends of which may be respectively fastened to opposite sides of the sounding-chamber portion 1 near the outer end of the latter. The posterior end of each member 16 may be provided with two suitable structural branches or arms or divided parts 17 and 18. lhese two sets of arms may be fastened to the opposite sides of the restricted portion at advanced points relative to the small opening \ol' the restricted portion and relative to the main travel of sound through said restricted portion.

lln the form shown in Figs. 16 and 11,

there is provided a stable sound conducting member 19, of hanging bridge structure, having at its anteriorend two tangential arms or branches 20, which are attached in this instance to. an upper side of the soundingchamber portion 1 or in this instance to a plane wall. The sound conducting member 19 is provided at its posterior end with two stable arms or branches 21, which are attached to in this instance a forward side oil the ti l restricted portion near the upper opening of the latter. 'llheretore it is apparent that novel tangential members may be attached to one or more points to a wall of acoustic device, or to a plane wall thereof.

For reinforcing the connection between the sounding-chamber portion and the restricted portion, 1 may provide in this-instance, as shown in Fig. l a dowel pin 22, which may be mounted in the inner end of the sounding-chamber portion and may be tightly fitted in a hole provided therefor in the forward end oit'the ring; section 7. For further reinforcing the connection between the sounding-chamber portion and the restricted portion, I may provide in this instance a bridge piece 23, shown in Figs. 2,

neeaeaa l and 11, which may be glued to and overlap the sounding-chamber portion 1 and the under side of the ring section 7.

In Fig. 41 have shown the feature of grain in relation to the vibratory body, when m p a wooden body is employed and when wood may act to support the resilient members. Soundi'mpulses, of any frequency that may be employed from asource of sound, progress with great freedom of movement with the grain of wood.

One of the functions of a 'wooden wall. such as, by way of example, I have shown in Fig. 4 is to vibrate to, or assimilate the frequencies of, a violin or piano or other inso struments, as it may be understood from the inherent nature of the invention. And in one adaptation of the invention one 'func-' tionof the members, 12 for example, is to have elastic forces in contact with the vibratory body under the influence of such frequencies and so distributed as to increase the desired resonance efiects.

ln Fig. 5 is shown the acoustic device without the means adaptedfto give expres- 9 sion to additional frequencies. The resonant wall in. this Fig. 5 is shown bare of any form of elevated member that may be adapted to co'operate tl'ierewith.-

in the operation I of this amplifier, the restricted portion may be connected to sound reproducing means, and the sound waves may be conducted through the restricted portion ina pluralityot directions. The sounding-cha-mber portion is preferably adapted to 10W serve as a sounding-board to respond to and amplify the sound waves conducted to it through the external suspension means.

lln the employment of my invention l prefor to malre use of sound vibration conducting means similar to as shown in Figs. 7

and 8 and numbered 12, but the particular form to be used in any case to give the desired result may be determined by experiment. l have found by perimenting that a plurality of free jutting sound vibration conducting members for: wardly placed on the amplifier relative to the small opening of the restricted portion of the amplifier and secured to the sounding-chamber portion of the amplifier and composed of individual elements and without longitudinal interference, such as, tor instance, branches or arms, is the best construction to. use in connection with the term of the amplifier shown when reproducing or recording sounds. The constructionmay be such that good results are obtained when the adjusted members 12l are adapted substantially independent of tension to regulate the rate of vibration etc. within their respective structures.

As shown in Fig. 7 the bars or rods or sound vibration conducting members 12 may be inserted all or part oil the way through my years of ex- 1m the walls of the restricted portion if desired or they may be connected or secured to the outside surfaces of the walls of the restricted portion similar to other members showing in Figs. 9, l0 and 11, therefore I do not wish to limit myself to one manner of fastening, securing, uniting or connecting any or all of the members 12 or to the manner of fas tening, securing, uniting or connecting any or all of the other sound conducting members shown. Different results occur by the use of different connection means. I i

. While a predetermined number of sound vibration conducting means produces'a different result than by the employment of a less number, yet I do not wish to limit my invention to a certain number of conducting means, for the obvious reason that different people have different tastes for music and demand different results. I desire to connect the bars or rods or sound vibration conducting members 12 at forward oints on the restricted portion of the ampli er, but I 10 not wish to limit n invention to} connec tions made only in t at manner. Gonsid e 1 ing the broad. aspect of myv inventiomiti' is believed the language and sense of t is speci fication will make certain. changes in the acoustic art as self-evident to a mechanic. Further, it willthen be seen that different forms and sizes and kinds of amplifiers or acoustic devices may be used in connection with the elevated members adapted for the purposes specified. Am lifiers and recording devices and acoustic evices, and the like, of different sizes and shapes and different wall thicknesses may require sound conducting members or sound-boards of different lengths'and different cross sectional dimensions, while yet taking advantage of the laws regulating pitch in solids." Nor do I limit my invention to a sound conducting member made of wood; any good stable substance which will conduct sound in an advantageous or facile manner may be used. I say an acoustic device or amplifier preferably made of wood, which means I ma .use other materials in the (ionstruction of same and with satisfactory results.

While, in a scientific sense, sound cannot be conducted or 'conveyed, but is propagated,

similar to one ball hitting another (aJarring process, I might say) ,I want it understood I do not limit my invention by the use of the words or terms sound conducting member or sound conveying member or sound conducting means or similar words or terms,

- or words or terms ofsimilar meaning.

I realize that many modifications of this invention are possible, therefore I say my invention is not limited to these particular constructions shown and described and it is my intention to cover all other modifications which may be made without departing from the spirit of my invention or the scope of the claims.

I also wish it to be understood that the several features of this invention may be used either singly or collectively without departing from the scope of the claims. I believe I am entitled to all that is inherent in the invention if found novel. I

What I claim as new, and desire to secure by LettersPatent of the United States, is, as follows: 1. A phonograph sound amplifier compris mg a restricted portion adapted to receive sound waves, a soundin -chamber portion connected to the restricte portion, the inner surface of the restricted portion and soundng-chamber portion having a varnish coating, and an asphaltum coating over the varnish coating.

2. A sound amplifier comprising a restricted portion adapted to receive sound waves, a sounding-chamber portion connected to the restricted portion, and an asphaltum coating on the inner surface of therestricted portion and sounding-chamber portion, said coating being pumicated.

3. In an acoustical apparatus a restricted portion connected to a sounding-chamber portion, and an asphaltum coatin on an inner surface of the sounding-chem er portion.

4. In an acoustical ap aratus, a sound passage having an inlet an an outlet, a varnish coating onan inner surface of said sound passage, and an asphaltum roughened coating on the varnish coating.

5. An acoustical apparatus comprising an air passage, said air passage having wal s of increased cross sectional perimeter, and a coating having asphaltum as a base of said coating on an inner surface ofsaid walls.

(3. A sound amplifier comprising a tube having a resonant covering of the surfacestructure of asphaltum dry on the interior of said tube.

7. A sound amplifier or resonator, comprising a restricted portion and a soundingchamber portion, an inner surface of the restricted portion having a flexible coating and a coating havin asphaltum as a base of said coating over said flexible coating.

8 A sound amplifier, or the like, com rising ,a restricted portion and a soun gchamlfer portion, and a resonant member of elevated structure outwardly connecting the said two portions, and said member arranged to transmit sound vibrations to the soundingchamber portion in spaced relatlon to the sound waves which pass through said two ortions of said sound amplifier, or the ike. Y

9. A soundam lifier comprisin a restricted portion an tion adapted to serve as a sounding-board, a

a sounding-cham r por-.

till

solid sound conducting member in contact only at its ends-and at spaced apart plates to both of said portions, said sound conducting member having a length longer than the measurement along the walls of the said two portions between the places of contact of said sound conducting member with said two portions. y

10. A sound amplifier comprising a restricted portion and a sounding-chamber portion, two resilient members arranged bridge-like in air space and on opposite sides respectively of said two portions, said two members having predetermined cross sectional dimensions to help control the volume of impulses traveling through their respective bodies, said two members secured at one Oil their ends to the outside of the restricted portion and connected at their other ends to the sounding-chamber portion a predetermined distance from the restricted portion, said two members having approximately equal lengths.

ll. lln a sound amplifier or recording device, a tubular member, and a plurality of,

firm sound conducting means connected to one exterior wall of said tubular member at one of their respective ends, said sound conducting means being connected endwise at torwardpoints longitudinally thereof relative to the travel of the sound waves through said tubular member.

12. A sound amplifier comprising a restricted portion and a sounding-chamber r portion and two sets of resilient members,

said members being arranged to form elevated bridge-lilac structures having mass, the anterior portions of one set of members being placed opposite and largely in a plane with the anterior portions ot the othor set, andthe posterior ends oil one set of members pointing in a general direction toward the posterior ends of the other set, and the said sounding-chamber portion extending between the anterior ends of the two sets ot members and substantially braced thereby, and the said restricted portion extending between the posterior ends of the two sets of members and secured firmly thereto, substantially for the purposes specified.

13. A sound amplifier having a longitudinally increased cross sectional perimeter, so increased in the general direction of the travel of the sonorous waves, embodying a plurality of stable sound conveyors raised bridge-like in air space, said sound conveyors being attached at their posterior-ends at advanced points relative to the general travel of the sonorous waves, said sound conveyors having their anterior ends attached near the large/opening of said sound amplitier, said sound conveyors being free to vibrate of each other for the purposes specified.

ll. A sound amplifier or recording device incense comprising a hollow body having a sound passage therethrough and having a side com posed of a resonant sounding-board and a plurality of spaced elevated sounding bars on the outside of said passage and extendin both. transversely and longitudinally thereot.

15. An acoustical ap aratus or sound amplifier for a phonograph or the like, embodying an outwardly elevated member of predetermined weight adapted for conveying sound vibrations in a facile manner, said member connected to adjacent vertically arranged sides of said apparatus or sound amplifier, said sides being not homologous.

16. A sound amplifier having resonant walls, and outwardly provided with an elevated structure adapted to increasethevolume of sound, said structure attached to two separated places on said walls, said elevated structure having a miter-joint and ample body, and said elevated structure attached at one of its ends where the sound is not the most forcibly reflected from within against the internal adjacent wall surface.

17. In a sound amplifier for blending tonal eil'ects, spaced apart vibratory members largely exterior thereto but extending to the interior thereof, said members. forming an acoustically associated group and each respective member having a length largely longer than the shortest distance between its ends of abutment, there being an air space between the respective members and a relatively small distance between adjacent members.

18. in a sound amplifier having a restricted portion provided with ring sections with the grain running longitudinally of the sections, a sounding-chamber portion communicating with the restricted portion, and a resonant member elevated relative with and secured firmly to both said portions exteriorly thereof, substantially as and for the purposes specified.

19. An acoustical apparatus including a tubular body having tensioned walls and thick untensioned walls and a raised resonant adequate member connected to said tensioned and untensioned walls.

20. In an acoustical apparatus or the like, having a tubular portion with large orifice, and a plurality of exterior spaced soundboards elevated relative with said portion and secured to said portion about said orifice.

21. In a sound amplifier for a phonograph I or similar inventions, a sidewise homogeneous member projecting away therefrom.

22. A sound amplifier or resonator having a tubular body provided with a unilateral member having an elasticity adapted to the nature of the elasticity of a wall of said tubular body, said member being arranged so as to favorably transmit impulses on said tubular body, said member having a free length adapted to independently increase the lid livery end of said amplifier or" resonator.

. 24. A sound amplifier, comprising a solid 1 barof desired elasticity, said bar capable of responding to one point on the sound amplifier when sounds are passing within, saidbar having substantially uniform cross sectional dimensions, said bar being spaced away from the sound amplifier, thereby to have a greater resiliency at one of its ends.

25. In a sound amplifier having a bend therein, a tubular restricted portion adapted to receive and transmit sound wafves from within and from without the tube,a sounding-chamber portion likewise adated;afnld connected therewith and having walls'com paratively tinnner, and continuous means of substantial mass adjacent the sides of said portions, said means elevated in .air space tangent to the sounding-chamber portion, said means having predetermined bodies [adapted to help increase the frequencies and volume of the sound generated within said amplifier.

26. In combination with a suitable sound amplifier comprising a restricted portion and a sounding-chamber portion, suitable as a sounding-board, elongated means said means .being the shortest practicalstableexterior resonant means elevated relative to said portions and connecting a predetermined'place on the restricted portion to a predetermined place on the sounding-chamberportion substantially as and for the purposes specified.

27. A sound amplifier comprising walls confining a rdstricted portion suitable with a sounding board connected therewith including resonant means, and acoustic means, said acoustic means being the shortest suitable acoustic means connecting a (part of the restricted portion to a part-of sai board, said acoustic means supported free through air space, said acoustic means having cross sectional dimensions adapted substantially independent of tension to hel reg ulate the impulses traveling throng the body of said acoustic means substantially as herein described for the purposes specified.

28. A sound amplifier having a turn therein having thick substantially annular walls and thin walls and embodying an apparatus of adjusted solids, comprising a group of individual sound conducting members, each of said members outwardly supported for sounding.

vibration, said angular and thin walls supporting each of said members in. spaced acoustic relation thereto, and the group or said membersjutting through air space, and the group adapted to translate relative to the forced travel of sound the impulses trav-- eling through the respective bodies of each of said members.

29. In an acoustical apparatus, a restricted and a tubular body having an inlet and outlet and adapted to be secured to sound trans- ;mitting means, and a plurality of individual members exterior thereof and secured flush to the side walls of said tubular body at their ends only, each of said members being secured on an opposite side of said tubular body to another of said members, and a plurality of said members firmly secured in a jutting manner at advanced points relative to each other and relative to said inlet, advanced members being of smaller size.

30. In an amplifier or acoustical apparatus, a tubular body'and spaced sounding-boards, there being a plurality of spaced resonant members running convergingly free on opposite sides of said tubular body and secured to same and secured to said sounding-boards.

31. A sound amplifier comprising resonant walls enclosing a sound passage, said sound passage having opposite walls respectively supporting a plurality of unilateral elevated resonant members free for vibration, said members secured at their respective opposite ends to the respective faces of said opposite walls.

32. A sound amplifier or recording device, comprising a restricted portion and a sounding-chamber portion connected therewith,

"sections laterally'supporting for audible vibration one or more separate stable resonant members.

33. A sound amplifier having a curving flaring sound passage and a plurality of separate permanentsound-boards arranged aslant about the largest end of said passage and in resonance therewith for purposes of evenly distributing sound vibrations. 34. A sound amplifier having an air pussage and embodying an exterior bar-like separate member held at an increasing distance away from the largest portion of said sound amplifier by anterior and posterior means of any suitable nature to form a path for sound vibrations, said member being of desired and alterable acoustal value whereby the combined acoustal efiects of the entire acoustal structure will bethe tones and over-tones coming through the air passage of the sound amplifier and the over-tones transmitted through the member.

35. A sound amplifier for phonographs, having tapered sides and a plurality of extill? all terior separate bar-like analogous members connected respectively to analogous sides, for purposes set torth.

36. A sound amplifier in elevation having substantially analogous sides and sides not homologous in comparison, and an exterior suspension stable member, whose vibrations are maintained by'its-own elasticity, connecting one of the first named sides to one or the second named sides.

37. A sound amplifier comprising a restricted portion having an incurved outer face, and a. resonant board secured to said portion projecting away from the outer face thereof and largely of uniform dimensions from said face and presently extending sub stantially in the direction of the axis or said amplifier.

38. A. sound amplifier comprising a restricted portion and a resonant board secured to the side of said portion projecting away tromthe outer face thereof in a direction opposed to the main travel of the sound through said portion. 1

39. A sound amplifier comprising a resonant restricted portion having an incurved outer face and a concave curved inner face, and a resonant board secured between the ends of said portion projecting away from the outer face thereof and forwardly thereof, and a sounding-board secured to said resonant board, said sounding board being in combination of adequateacoustical value.

40. Al sound amplifier comprising a resonant tube having one surface restrained and of a surface-structure of asphaltum dry on said surface. 1

41. A sound amplifier for phonographs comprising a tube and spaced apart soundboards in resonance With and secured to said tube exterior thereof, said tube having an annularrestr'icted section, said section being formed as an integral Whole.

42. An acoustic apparatus for phonographs or the like, comprising a tube and spaced raised sound-boards in resonance with and secured to said tube exterior thereof,-.said tube having an annular restricted section, said section being formed as an integral mass, and said tube being formed to diverge abruptly away from said section;

43(1l sound amplifier comprising a tube formed of annular ring sections each section being formed as an integral Whole.

44. A. sound amplifier comprising having a restricted portion and a chamber, said restricted portion being formed of annular ring sections, each of said sections being formed as an integral whole,

a tube soundand said sound-chamber being formed of resonant boards extending from said restricted portion.

45. In combination in a phonograph sound amplifier, two resonant portions having resonant walls adapted for audible vibration,

masses each portion having an outlet for sound vibrations, and oppositely disposed spaced arcuate soundin boards connecting said portions, the outlet of each portion being located between said sounding-boards, said sounding-boards being of a size suitable, for audible vibrations and adapted to conduct vibration transversely of the device,

46. An acoustical apparatus comprising a diverging chamber having different natural periods of vibration, and; a plurality of closely spaced vibratory means connected directly to said diverging chamber to intro duce new periods oi vibrations at different points of divergence of said chamber.

ll. The combination with a sound reproducing apparatus, of a diverging resonant chamber provided With tension, and a plurality of closely spaced resonant means connected directly to thesaid chamber to pro vide new periods of vibration at difierent and also similar points of divergence of the said chamber, v

48. la a sound amplifier a resonant wall under tension, and spaced resonant means connected to said with at the respective ends of said means, said means beingconnected endwise only to desired points on said well relative to the'frequencies of said Wall, to provide the desired acoustic stress when the device is in operation 49. la a sound amplifier, two tube portions respectively having resonant ivalls and adjacent sides; a separate resonant member, said member being located between said adjacent sides to introduce exteriorly new frequencies of vibration respective of one of said portions.

50. A sound amplifier having a reverse curve therein and a spaced elevated exterior sound-board primarily adapted for its natural frequency capacity to produce new frequencies, said sound-board bridging parts of said amplifier on either side of said curve whereby an increase of frequencies is the result.

51. In combination with a sound reproducing device, a thin resonant member, an air ill IND

space adjacent said member adapted forvibration, vibrator means on one side of said member and e evated respective thereto and connected directly thereto, said means being uniformly spaced and of substantially the same acoustic value, the dimensions of said means and their form and ability to respond when subjected to vibration being determined by the dimensions and form of said thin resonant member in connection with said device, said means connected in opposed directions substantially an equal dis tance from the edges of said member, thereby to produce new frequencies of vibration with the use of said means.

52. In combination with an acoustic device adapted to function like a sound-board,

a. series of fibrous bridge-like soundboards primarily adapted to increase the audible frequencies of vibration, said sound-boards having a response frequency adapted for sympathy with the frequency of a side of the device where said sound-boards are connected, said sound-boards being elevated and spaced relative to the desired vibration of the device, and said sound-boards being so spaced as to be distributelil upon the surface in such manner that the saidsound-boards are more resilient at one of their respective ends than at the other of their respective ends, whereby the acoustic stress will be applied adjacent the middle areas of the device.

53. in a sound amplifier ap iaratus, the combination with a tube, of a sound-board, said sound-board having a natural frequency relative to the natural frequencies of said tube, said sound-board being located exteriorly relative to said tube. said sound-board being proportioned directly by and to the natural frequency capacity of said tube to respond to frequencies over the range of voice and music frequencies and to the natural frequency capacity of itself to alter certain frequencies with considerations being taken in the combination of parts of the frequencies desired and of the frequencies desired altered and of the space occupied by said soundboard and of the space adjacent said soundboard, and means for securing resonance between said sound-board and said tube, whereby the volume of sound will be increased and certain desired frequencies otherwise lacking in the said tube produced directly by'the use of said sound-board, as defined, when the apparatus is in operation.

54. In an acoustical apparatus having diverging walls, resonant sound-boards spaced from said walls, the progress of divergence of said walls being directly related to the number and size of the sound-boards employed in the apparatus, there being the desired number of sound-boards, and each sound-board adapted for vibration and adapted to vibrate the said walls of the apparatus and to produce frequencies of vibration in harmony with the vibrations progressing through the saidavalls, the said sound-boards being connected with the said walls at desired locations, and the said soundboards being of a size determined by the space to be occupied between the locations and by the harmony of results desired in the apparatus, there being at least two soundboards of sufficient dimensions to obtain the desired results therewith.

1'35. A sound amplifier adapted for a phonograph or similar inventions, having a structure of increased dimensions, an exit for sound vibrations, andst-able raised exterior means capable of natural frequency vibrations bridging parts of said structure, whereby when the said parts are in vibration certain frequencies not to be produced or reproduced by the parts'of said structure alone are produced by the aid of said means and are projected evenly from and about the sides of said exit.

56. A sound reproducing device comprising a wall and a vib 'atory member attached at an acute angle to said wall to produce vibrations by means of said acute angle.

57. A sound reproducing device comprising a wall and a vibratory member having a tangential structure attached to said wall to introduce a torsional strain therein.

58. A sound reproducing device comprising a curved wall and a sound reproducing member attached at a desired angle to the surface thereof vto introduce vibrations through said angle.

59. A sound reproducing device comprising a wall and means on opposite sides of said wall to introduce vibrations transversely of said wall, said means being attached transversely of said wall.

60. A method of increasing the frequencies of vibration of asound amplifier which consists in providing raised resonant plane members in pairs, of having the desired natural frequency in said sound amplifier and in and relative to said members, and of having each respective member of each of said pairs directed from outward surfaces of said sound amplifier.

61. A method of increasing the volume of vibration of a resonant sound amplifier adapted for a phonograph or other inventions, which consists in providing adjacent an outer surface of the amplifier a plurality of spaced elevated bars, in providing at least two points of connection on the amplifier for said bars, of having each of said bars capable of desired response frequency.

(32. A method of increasing the frequencies of vibration of a sound amplifier which consists in distributing a plurality of elevated resonant board members upon the sound amplifier relative to the resiliency thereof to span surfaces thereof, and in having desired dimensions and desired natural frequencies for said members, and in having means for securing the members to particular points on said sound amplifier, and in having desired vibration from a source.

A method of regulating the acoustics of a sound amplifier which consists in distributing a plurality of elevated resonant members at advanced points relative to one of their ends and relative to the inlet orifice of thesound amplifier upon the sound amplifier, and of having the desired dimensions and desired natural frequencies for said members and for the sound amplifier.

In testimony whereof I have signed my name to this specification.

CHESTER ALFRED LIN TON.

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