The talking machine world (July-Dec 1923)

October 15, 1923 THE TALKING MACHINE WORLD 195 LATEST PATENTS RELATING Washington, D. C, October 8. — Sound Box. Arizonia Z. Coats, Newbern, Tenn., assignor of one-half to Elmer Headden, same place. Patent No. 1,461,597. This invention relates to sound boxes for phonographs and the primary object thereof is to provide a device which will amplify the sound without distorting the sound waves and which will eliminate the emission of scratchy and grinding sounds common to sound bo.xes of the diaphragm and reproducing needle type. Another object is to provide simple and efficient means to efTect a duplication of the sound vibration produced by a single stylus or needle and to so encase the diaphragms that they are protected from the accumulation of dust thereon and consequent deadening of the sound. In the accompanying drawings Figure 1 represents a side elevation of a tone arm equipped with this improved sound box. Fig. 2 is an edge view or front elevation thereof with the tone arm broken off. Fig. 3 is a central vertical section taken on the line 3 — 3 of Fig. 1. Fig. 4 is a side elevation of one section of the sound box taken from the inner face thereof with parts in section. Fig. 5 is an enlarged transverse section taken on the line 5—5 of Fig. 1. Fig. 6 is a side elevation taken from the inner face of one section of the sound box with the diaphragm removed. Fig. 7 is a detail perspective view of the ring which is located between the diaphragms. Phonograph. Wm. M. Venable, Pittsburgh, Pa. Patent No. 1,461,334. This invention relates to phonograph apparatus which may be used either for recording or reproducing purposes and it is particularly applicable to phonographs of the disc type. The present application is a division of coending application No. 370,521, filed April 1, 1920. The principal object of the invention is to provide a simple means for maintaining the sound box stylus in its correct position with respect to the record without abandoning the use of the fixed pivotal support for the sound bo.x which has proved so advantageous in prac tice as to have become almost universally applied. It is the further intention of this invention to provide means to accomplish the foregoing object which can be readily applied to the various types of phonographs already on the market with but little, if any, fitting or change. These, together with such other objects as are incident to the invention, or which may appear hereinafter, are obtained by means of a construction which is illustrated in preferred form in the accompanying drawings, wherein: Figure 1 is a plan view of an apparatus embodying the improvements showing parts of the phonograph broken away; Fig. 2 is a side elevation of the apparatus illustrated in Fig. 1; Fig. 3 is a plan view of the improved apparatus illustrating the invention as it might conveniently be applied to that type of phonograph known on the market as the Victrola; Fig. 4 is a side elevation of the apparatus illustrated in Fig. 3. Method of Making Phonographic Records. Earle W. Jones, New York, and Edward R. Harris, Arlington, N. J. Patent No. 1,461,849. This invention relates to the art of recording and reproducing sound waves, and particularly to methods of manufacturing an original or master phonautogram and manufacturing dies therefrom which may be used for the stamping out of commercial record tablets. One object of the invention is generally to provide an improved process or method of making phonographic records which will do away with many of the present-day objections and which will further cheapen the cost of producing record tablets and materially expedite their manufacture. Figure 1 is a relatively small top plan view of the glass plate containing the master record in the form of a phonautogram traced thereon. Fig. la shows the manner in wliich the recording stylus is set in cutting the master record, the view showing a section of the plate 10 and a face view of the recording head and stylus; Fig. 2 is a fragmentary section through the glass plate showing the film thereon after the phonautogram has been traced, the film being shown as relatively thick; Fig. 3 is an enlarged face view of a portion of the plate with the fihn thereon and the phonautogram traced through the film; Fig. 3a is a correspondingly magnified fragmentary face view of a phonautogram showing the minor irregularities formed by the "partials"; Fig, 4 is a very greatly magnified fragmentary section taken through the plate transverse to the direction of the phonautogram showing in an exaggerated manner the way in which the recording stylus cuts through the film; Fig. 5 is a section of the master record and its film, the sensitized plate against which the film is disposed and the ray filters which are used in printing the positive upon the sensitized plate; Fig. 6 is a face view of the sensitized plate 13 after it has been chemically treated, the phonautogram being indicated on the plate by black opaque lines; Fig. 7 is a sectional view of the plate shown in Fig. 6 disposed against the second sensitized plate to form the "mother stencil" or second negative; Fig. 8 is a face view of the second negative or '"mother stencil" after it has been chemically treated, showing the phonautogram in white lines upon a black opaque ground; Fig. 9 is a sectional view of a copper plate intended to form a die having thereon a sensitized film, the view showing in section the "mother stencil" disposed against the sensitized face of the copper plate; Fig. 10 is a face view of the copper plate after the phonautogram has been photographed thereon and the sensitized film has been chemically treated; Fig. 11 is a very greatly enlarged sectional view of the copper plate, th^ portion "a" of the plate showing the sensitized film on the copper plate after it has been chemically treated, the portion "b" showing the phonautographic lines of the sensitized film after they have been baked; Fig. 11a is a like view to Fig. 11, but showing the copper plate after the film thereon has been baked and scrubbed and cleaned; Fig. 12 shows the copper plate after it has been etched and at the left hand shows the enamel, formed by baking the sensitized line or strip, as having been lifted; Fig. 13 shows the copper plate after it has received the second etching; Fig. 14 shows the complete die as it is used in impressing the record in a record tablet, the die and record tablet being in section; Fig. 15 is a fragmentary sectional view of the record tablet showing the exact form of the record groove as formed in the tablet; Fig. 16 is a sectional view of a record tablet showing the extremity of the reproducing stylus and showing the manner in which it engages within the record groove. Tone Arm. Frank Oberst, Glendale, N. Y., assignor to Sonora Phonograph Corp. Patent No. 1,461,829. This invention relates to tone arms for talking machines and has for its objects to provide a tone arm of fibrous material, having a joint whereby the arm may be lowered to engage the stylus with the record disc and whereby the arm may be elevated in order that the stylus will be accessible for insertion or removal. A further object is to produce a tone arm of the character described, in which the sound passage will be unobstructed. A still further object is to provide means for locking the arm in inoperative position by devices which will be entirely disengaged when the arm is in operative position, whereby rattling and other objectionable sounds will be obviated. .A. further object of the invention is to provide means of the character herein described, simple in construction, thoroughly reliable and efificient in its purpose, positive in operation and inexpensive to manufacture. The inventive idea involved is capable of receiving a variety of mechanical Expressions, one of wliich for the purpose of illustrating the invention is shown in the accompanying drawings. The invention will be first described in connection with the accompanying drawings illustrating one embodiment of the invention, wherein similar reference characters are used to designate corresponding parts throughout the several views. In the drawings — Figure 1 is a longitudinal section of a tone arm embodying the invention, and Fig. 2 is a bottom plan view of the movable element of the arm and a co-operating device carried by the stationary member of the arm. Method of and Apparatus for Making Phonograph Records. Giacomo Allegretti, Stockton, Cal. Patent No. 1,462,729. This invention relates to improvements in phonograph-record making, the principal object being to devise what may be termed a phonoengraving process and an apparatus by means of which the process may be carried out. By means of this invention master phonograph records may be produced directly and (Conliitued on page 196)