hobby1

Simple acoustic calculations show, that the potential opportunity of the harmonic sounding of a violin, is stipulated by its proportions. But (!), it is only the potential opportunity and for the realization of it some additional conditions are necessary. What is the way to do it ? Probably some old italian violin makers knew that.

Tools

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The sounding of my violas.

. 48 kBit/s, 16,000, Stereo, (150 kB)

. 48 kBit/s, 16,000, Stereo, (112 kB)

violas

The varnish is processed (painted) by salts of iron (Fe).

I offer a simple method of research of a violin by means of electromagnetic vibration of the assembled instrument. ( I have been using this method for already more then 15 years. )
Sounding of the assembled instrument is raised by an electromagnetic field through the bridge, on which small permanent magnet (SmCo ..etc) is fixed. The frequency of a generator of oscillations (oscillator) changes (swips) manually through the range of 100 - 10000 Hz and is controlled by a digital gauge. The signal is registered by a microphone (at F-holes) and, after amplification, moves (gives) on input Y of the two-coordinate gauge (recording system). The signal comes to the input X and the amplitude of it is proportional to frequency of the oscillator.The curve of a violin sounding in some frequency range is recorded. In a certain point of the curve it is possible to touch a case of a violin by hand and to find a place of the most notable change of the amplitude of the signal, etc.

I don't give many details as I hope that the readers possess the necessary experience and knowledge.
As well as any other technique it has the merits and minuses.

Bridge, on which permanent magnet is fixed.

The permanent magnets of different size.

For example -
(only !) Low frequency area (200-600 Hz)

In some places (points) of the deck I used to add some quantity of a special plastic and measured.

A knock with a wood in the bridge end its spectrum analysis.

Sometimes it is necessary to define a phase of the vibration in different areas.
The signal is registered by a sensitive device and sent to by a multy-ray oscillograph.

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