The talking machine world (Jan-Dec 1908)

62 THE TALKING MACHINE WORLD. for recording purposes with such instruments for improving the qualityof the record. It is well known that in order to produce natural sounds, practically all the sound waves produced at a given time should reach the ear at the same instant. If, for example, a person is listening to a speaker or singer in a large hall, the waves will, of course, travel directly to the listener, but there will also be a reflection of sound waves from the walls of the room which reach the listener somewhat later, and a few of \ — \ / these reflections will reach the listener in ampie time to augment the directly received sound wave — others will travel and be reflected so often and be in consequence so weakened that their influence on the spoken word or the tones of music are nullified; yet these reflected waves have an influence on the understanding of the more direct sound waves which reached the listener first. The reflected waves plus the direct waves give to every such room or space its own tone of resonance, its own peculiar character. Now in the case of phonographic reproduction, the belief is that the reproducer diaphragm emits from the sound box waves traveling in almost every direction, so that two principal classes of waves issue therefrom into the resonating horn, namely, those which travel in a direction parallel or slightly inclined to the axis of the horn, which travel for a considerable distance without reflection and which may be called direct waves, and those whose direction of travel is considerably inclined to said axis, which are reflected after traveling a short distance, and which the inventor terms "cross vibrations." It is obvious that since the path of travel of the cross vibration is longer than that of the direct vibrations, they will reach the listener later than the direct and produce an unpleasant effect, a rumbling sound; they interfere constantly with the succeeding direct waves and cover up or destroy or counteract the same. This invention has for its object the provision of means which furnish an easy outlet for direct waves and hinder or obstruct the passage of cross vibrations, whereby all, or a large part of said cross vibrations will be eliminated or converted into direct waves. Fig. 1 is a plan view of a perforated sheet of metal which may be used in the construction of one form of .the invention. • Fig. 2 is a plan view of a similar sheet which may be used in constructing another form of the invention. Fig. 3 is an end view showing how the sheet of Fig. 2 may be formed into concentric tubes. Fig. 4 is an elevation of a tone purifier embodying the invention. Fig. 5 is a detail viev." of one of the tubes of Fig. 4. Fig. 6 is a detail view of another tube of Fig.' 4. Fig. 7 is a saction on line 7 — 7, Fig. 4. Fig. 8 is a section on line 8, 8 of Fig. 7. Figs. 9, 10, 11 and 12 are similar to Fig. 4 and illustrate various modifications. Fig. 13 is a vertical sectional view showing one form of the invention as applied to the reproducer and amplifying horn of a phonograph. In all the views corresponding parts are indicated by the same reference numerals. Recorder a>d Reproducer. Thomas H. MacDonald, Bridgeport, Conn., assignor to Aiherican Graphophone Co., same place. Patent No. 873,7G3. This invention relates to recorders and reproducers for talking machines and has for its ob.iect to improve the construction of the same, and more particularly the construction of the sound box with relation to the diaphragm, and the connection of the sound tube to the sound box. With this object in -saew the invention consists of a circular sound box whose walls support the diaphragm, the crown or top of the box being dished or concave with its center very close to the diaphragm and its periphery, where.it joins the walls, many times farther removed from the diaphragm, so that at the outer edge the air Talking Machine Record Cabinets OUR SPECIALTY So good -we offer you variety of essellers. You value in a tablished can sell from our catalog. It is required in every popular store. More goods sold with less effort is the result of Cadillac character. caterino; Cadillac Cabinet Co. T. M. R. C. Dept. DETROIT. MICH. space in the sound box is many times greater than in the center. This is accomplished by placing the dished crown of the sound box with its convex side toward the diaphragm and its concave .side on the exterior of the box. The sound tube is connected to the concave side of the sound box crown by a ball and socket joint, the socket being preferably struck up integrally with the metal of the crown, and the ball of the joint being formed integral with the sound conveying tube. Within limits the inventive idea may be embodied in a variety of structures, and for the purpose of illustration there is shown in the accompanying drawings a recorder which embodies the invention, in which drawings. Fig. 1 is a transverse vertical section of a recorder with the recording style in place upon a record tablet; and Fig. 2 is a bottom plan view of the same. Phonograph Hoex. Frank B. Norman, West Orange, N. J., assignor of one-half to Samuel I. Kopatousky, Newark, N. J. Patent No. 872,577. This invention relates to a phonograph horn, and is designed to provide a horn that is adapted to be folded up, and is made of separable portions embodying a tapered sleeve at the small end, arms to be detachably secured thereto to form the large end, and a covering of fabric to be attached on one end to the tapered sleeve, and adapted to be buttoned or clasped to the ends of the rods forming the large end of the horn. The invention is further designed to provide means for limiting the entrance of the rods forming the large end of the horn into the tapered sleeve, and also * to provide a covering f or the large end that can be folded up into a small space, this covering usually or preferably being made of oiled linen, or a similarly stiffened fabric which will throw the sound, giving it a tone that is noticeable from the absence of harshness, and this covering being detachable from both ends, it can be packed away, when the horn is in its condensed shape, with great ease. Fig. 1 is a view half in section and half in elevation of the improved horn when it is assembled. Fig. 2 is an end view of the tapered sleeve looking into the big end thereof. Fig. 3 is a view of one of the rods, and Fig. 4 is a perspective view of the fabric covering when it is detached from the horn. SorxD-REi'RODrci.xc: Machine. Luther T. Haile. Philadelphia, Pa., assignor of nine-one-hundredths to Jos. W. Shannon, one-tenth to Frederick .1. Geiger, and one-tenth to Logan W. JIulford. all of Philadelphia, Pa. Patent No. 873.937. This invention relates to sound-reproducing machines for the reproduction of vocal and instrumental sound waves from a "record" thereof, and has for its object to so amplify and modify the sound waves so produced as to restore, in large part if not wholly, their original tone and timbre, closely simulating the original sounds recorded: and, as incidental advantages, the elimination of the amplifying and discharging horn and its adjunctive parts, commonly employed with talking machines, and the metallic resonance resulting therefrom. To these ends this invention consists of a new instrument comprising the combination, in or on a containing cabinet, with an interiorly-disposed sound-reproducing machine, of any known