US1283571A - Phonograph attachment. - Google Patents

Description

0. W..SCHAUZ. PHONOGRAPH ATTACHMENT. APPLICATION FILED MAYII, 1918.

Patented Nov. 5, 1918.

OSCAR WM. SCHAUZ, 0F ADRIAN, MICHIGAN.

PHONOGRAFH ATTACHMENT.

Specification of Letters Patent.

Patented Nov. 5, 1918.

Application filed May 11 1918. Serial No. 233,85fi.

To all whom it may concern: Be it. known that 1, Ososn WILLIAM SoHAUz, a citizen of the United States, residing at Adrian, (227 Michigan St.) in the county ofLenawee and State of Michigan,

have invented certain new and useful llmprovements in Phonograph Attachments; and I do declare the following to be a full, clear, and exact description of the invention, such "as will enable others skilled in the art to which it appertains to make and use thesame, reference being bad to the ac-' companying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

My invention relates to a device for amplifying the tone of a phonograph, and for rendering more distinct the annunciation in phonographic reproduct ons, as well as for reducing the usual annoying scratching effect accompanying such reproductions.

To these ends my invention consists of the devices, construction and arrangement. of parts hereinafter described, and illustrated in the accompanying drawings in which,-

Figure 1 is a front'elevation of my device; Fig. 2a side elevation of one of the halves of rays-device, seen from its inner side, and Fig. 3 isa top plan view of my device.

Like numerals of reference indicate like parts throughout the several views.

My device consists of a structure composed of a block: made, preferably, of flat strips of wood boards, built up and glued or otherwise rigidly and closely joined ,to-'

gether to constitute substantially a solid block of approximately the contour, in side elevation, lllustrated in Fig.2 and in front elevation in Fig. 1. I prefer, for convenience of manufacture, to divide the block verticall into two equal parts as shown by the divi ing lines in the drawings, the halves being secured together face to face by bolts, as shown, or in any other suitable manner. The fiat top 1 of my device is designed to be secured to the under side of the sounding board of a phonograph, directly beneath thefoot of the pedestal of the needle carrying arm. The mouth 2 of the device is turned to ;the front of the phonograph. This mouth in outline is rectangular, and is "adapted to receive the smaller end of a phonograph-horn of the usual or any preterred construction.

Through the block, from its top to its mouth, extends a sound passage 3, the walls I lipse extends from side to side of the passage. From the line a to the line b the passage continues to widen both vertically and horizontally in such a fashion that here the cavity has assumed a substantially spherical form. From the line b the passage turns upwardly and forwardly in a hor zontal direction, gradually narrowing vertically and widening horizontally into a pas sage, rectangular in cross-section, as illustrated at the mouth 2 of the passage. The cross-sectional area of the passage 3 increases in a constant ratio from inlet to outlet. I

Through the block near its upper end'may be a thin horizontal slot 4: adapted for the reception of a thin flat'slide which may be employed to partly or .wholly reduce the volume of sound traversing the passage 3.

The theory which ll entertain as specific efiect of the sound passage, shaped as above described, upon sound waves during their passage through the instrument, is largely speculative and, being incapable of demonstration, need not be here elaborated. Practical employment of the device here described does, however, demonstrate that a sound passage, having the several successive contours described,-which contours have been determined after many long and careful experiments,do amplify and define the tones and sounds in phonographic reproductions, and that they do largely eliminate the unpleasant} scratchy effect usually accompanying the tones of a phono graph.

Having described my invention, what I claim and desire to secure by Letters Patent is- 1. In a device of the described character, a block having therethrough and leading downwardly from as top a sound passage of constantly increasing area in cross-section, which passage from its lower part curves upwardly and forwardly, such passage,-including such curve,being curvito the o linear in transverse outline, circular at its then widening to a substantially spherical inlet and which, at its outlet, merges into chamber, then curving upwardly and horirectangular transverse outline. zontally and terminating in rectangular 2. A device of the described character, cross-section. 5 comprising a body adapted for attachment In testimon whereof I aflix my signature 15 in a phonograph, saidbody havingtherein presence 0 two, witnesses.

through, leading from its top, a passage of OSCAR WM. SCHAUZ. gradually increasing area in cross-section Witnesses: from inlet to outlet, said passage being cir- WM. H. Crimes,

10 cular at its top, then widening to an ellipse, L. H. TREAT.

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