The talking machine world (Jan-Dec 1908)

54 THE TALKING MACHINE WORLD. ordinary construction in place therein; Fig. 5 is a plan view of tlie record disc sliowing the grooves spirally arranged in the surface thereof; Fig. 6 illustrates a part of the record showing a single record groove greatly magnified and disclosing the uudulatory form of the sound waves. PnoNOGBAPH. Hermann Schroeder, New York. Patent No. 89.5,900. This invention comprehends certain new and useful improvements in phonographs and relates ^particularly to a > casing or sound . amplifying means ■which aims to enhance the character of the sound. Figure 1 is a ^=^^'^ longitudinal sectional view of a phonograph embodying the improvements of the invention; Fig. 2 is a horizontal sectional view thereof; and Fig. 3 is a detail sec^ tional view illus trating a deflector that is employed. Phoa^ographt. Isidore Kitsee, Philadelphia, Pa. Patent No. 896,302. This invention relates to an improvement in phonography. Its object is to produce a phonographic record with the aid of which sounds may be reproduced. In the drawing. Figures 1 and 2 are plan views of records at different stages, and Fig. 3 is a sectional view of the finished record. To produce the final record in accordance with this invention, it is first necessary to produce the recording lines, due to the sound waves, in a manner so as to be able to photograph the same; and in the drawing. Figure 1 illustrates this step of the invention; and in this figure, 1 is the material on which the lines of record are marked, and 2 are the lines of record. The material 1 should be transparent, and the lines 2 -'Opaque to the rays of light. It is found that tracing cloth is well adapted for the purpose and a very expedient way of producing the lines of record is by •simply drawing, with the aid of a colored fluid, the lines on said cloth; the means to draw said lines being operatively related to the phonographic diaphragm. This plate or record is used as a positive to produce photographically a negative therefrom. The process of producing a photographic negative is well understood and does not need to be enlarged upon here. It suflices to say that those places which are in the positive opaque to the rays of light will be produced in the negative in a manner so as to be transparent to the rays of light and vice versa; the places transparent to the rays of light on the positive will be opaque to the rays of light on the negative, provided that the negative is made and washed in accordance with the usual process, and Fig. 2 represents such a negative; in this figure, 3 designates the part opaque to the rays of light and 2 the lines of record now transparent to the rays of light. To produce a record plate, wilh the aid of which sounds may be reproduced, recourse is made to the following arrangement: The inventor covers a suitable base, such for instance as a metallic plate, with a comparatively thick layer of gelatin, in which a chrome, such for instance as a bi-chromate of potassium, is dissolved. This plate is carefully screened from the rays of light. After the plate has dried, that is, ripened, it is stibjected to the rays of light wilh the interposition of the negative. The rays of light will, therefore, only strike those parts of the gelatin coating which are not protected by the opaque material of the negative. In other words, only sudi |i;\rls of the gelatin coating will be e.xposed to the light as correspond to the transparent lines of record on the negative; all other parts of the gelatin coating being screened from the rays of light by the opaque parts of said negative. After the necessary exposure, the gelatin plate is removed from the source of light. When a gelatin, intermixed with a • bi-chromate of potassium, is exposed to the rays of light, those parts on which the rays of light fall will become hard and dry, whereas, such parts which are screened from the rays of light will remain in their pliable state. When now a gelatin so prepared is moistened with luke-warm water, those parts, formerly exposed to the rays, will remain unaltered, but the parts screened from the rays will take up part of the water and will thereby swell up. The plate so manipulated will present a surface comprising raised and depressed parts. The raised parts are due to the swelling up of the gelatin formerly screened from the light, and the depressed parts represent the gelatin not raised through the action of the water. It has been necessary to thus make clear the action of light on gelatin having intermixed therein a bi-chromate of potassium, so that the production of the final record should be well understood by persons versed in the art. As stated above, the plate of gelatin is. after due exposure to the light, removed from this source. To produce the necessary change in this gelatin plate, so as to be able to use the lines of record for the reproduction of sound, it is necessary to depress these lines, or what is the same — to raise the parts intervening, and for this purpose the plate is subjected to the action of moisture. Fig. 3 represents such final record, and in this record, 5 is the support plate; 4 the prepared gelatin, and 2 are the lines of record, here shown in intaglio. HoEX. Leonard L. Terhune, Newark. N. J. Patent No. 896,672. The object of this invention is to produce a horn for use in amplifying the vibrations produced by the sound box of a phonograph or like instrument, of such a size that it shall possess greater strength for a given weight of material used and at the same time improve the carrying and amplifying qualities of such an instrument. Hitherto, in the manufacture and shipment of horns, great difiiculty has been experienced in producing a horn of the requisite strength to stand the wear and tear of rough usage from the thin material which it is necessary to use in such manufacture. It has been found that, by making up the horn of elements which have short curvature, the inventor is able to produce a horn from relatively light material which shall have, not only the requisite strength, but improved sound-carrying and amplifying qualities. The configuration of the bell and body of the horn lends itself admirably to the manufacture of the structure from other materials than sheet metal, as for example, papier mache or glass, and in case either of the latter named materials is used, the whole horn, i. e., body and bell mouth, may be pressed to shape m suitable molds or dies, thereby forming horns of a single integral piece of material, and the resulting horns will be found to possess greater strength and bett e r sound-carrying qualities than if made up of separate parts from those materials. In some cases a " conical body is', made of metal as usual and the bell of glass, papier mache or other suitable material. In any case, the petal sections are both longitudinally and laterally arc-shaped. In the accompanying drawings, forming a part of this specification. Figure 1 is a side view of a complete horn, embodying these improvements. Fig. 2 is a cross-section on line x — x of Fig. 1, and Fig. 3 is a similar cross-section of a modified form. Method of >Iakij,-g Souxd Records. William H. Hoyt, Wyoming, N. J. Patent No. 897,254. This invention relates to methods of making sound records, particularly of the fiat or disc type, and has for its object to provide a method for producing a light, strong and durable record of this character which will be practically unbreakable and which will not be affected by f# , ' i^ I — ^ .z_ changes of temperature or moisture. To this end the record is made of a suitable body, such as cardboard, and provided with a facing of celluloid or like material, which is connected Grinnell Bros. DETROIT, MICH. The New $200,000 Grinnell Building Conc i'dcil to he the m o .s t lu'nutiftil and host equipped Music House in the I'. S. Largest Michigan Jobbers of the complete EDISON ^ VICTOR Lines, including Records and Accessories We have evervthinc in SUNDRIES, including: AUTOMATIC STOPS, REPEATING ATTACHMENTS. HORN CONNECTIONS. CRANES. TONE MODIFIERS. BRUSHES, ETC. No annoying delays if you order from us. All orders filled same day received. We carry every Record listed hy the Edison and Victor Co.'s. Not one of each, hut dozens, yes. hundreds each of the more popular nuinhers. An extensive line of RECORD CABINETS at prices that are RIGHT. If you are a Victor or an Edison Dealer in our territory communicate with us and learn of somcthinK ver>' much to your advantage and profit. Address : — GRINNELL BROS., Grinnell Building DETROIT, MICH.