Books › The Violin: A concise exposition of the general principles of construction.., 1871 › scan 55
Scan 55
The Violin: A concise exposition of the general principles of construction.., 1871
8 lines. Read by computer on 28 September 2026. No printed page number was found. See the scan on archive.org.
1allow the passage of some rosined horsehair, and also with apertures corresponding with the f holes of a violin, to give the air contained in the case freedom to vibrate. If now we cause the case to vibrate, by means of the horsehair, a nodal line will be produced round its edges, and the sound will be the same whichever surface of the case we vibrate.
3If the two plates are of the same thickness, and identical in form, the nodal lines are the same in each and this is a method of proving the equality of the two plates. If they are not of the same thickness, the sound of both will still agree, but the nodal division will no longer agree in each. In the thicker one, the nodal lines will retreat from one another, while in the thinner one they will approach more closely together.
5It is evident from this that the back and belly of a violin vibrate always in unison. Let us examine now the part played by the air contained in the case of the instrument. We take a case formed of two plates, rectangular in shape, of the same wood, the same thickness, and giving the same sound for the same mode of division. They are united by sides also rectangular, pierced with two holes, analogous to the f holes of stringed instruments. The tables are pierced with holes to allow the passage of a skein of horsehair to put them in vibration. To make the column of air resound, we employ a slightly conical brass tube, flattened at the larger end, so as to present only a narrow rectangular orifice for the passage of the air.
7This apparatus is very convenient for the purpose of vibrating any column of air. In the present case,
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