Books › The Violin: A concise exposition of the general principles of construction.., 1871 › scan 49
Scan 49
The Violin: A concise exposition of the general principles of construction.., 1871
4 lines. Read by computer on 28 September 2026. No printed page number was found. See the scan on archive.org.
1violin. The arch is formed of two uprights glued over the corner-blocks and supporting bar at right angles to them. Instead of the post, a screw is fitted to this bar, which can be made to press more or less upon the belly. The effect of the sound-post is strongly produced when we apply the pressure of this screw. We now place a similar arch between the violin, and pierce a small hole in the back, to allow the screw to pass, so as to impinge upon the belly without touching the back at all. On applying the pressure of the screw the same result will be obtained, as if the post were in its place. Still more, if we simply place upon a violin, without a post, a heavy body, the violin resounds as though the post were there, provided the weight surpasses a certain limit. The exact proper weight can be found by means of a small cup containing a greater or lesser quantity of mercury. The effect of the sound-post is above all relative to the belly of the instrument, for the effect can be produced in a violin without a back, by causing a screw to press upon the single table of the instrument. The post does not play a part similar to that of the bridge in the marine-trumpet, for if we glue it in its place the effect is not altered. We arrive at the same results either by pressing the post against the belly by means of the arch already described, or by pressing the table upon it in a clamp.
3The function of the post is to render the vibrations of the two tables normal. To prove this, let us take a disc upon which reposes a bridge destined to sustain a string. When we cause this string to vibrate in a
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