Marty Kasprzyk

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About Marty Kasprzyk

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    Enthusiast
  • Birthday 06/02/1945

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  • Location
    Olcott, NY, USA
  • Interests
    Wine making, gardening, dog training,

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  1. I heard Joseph Curtin say in a presentation that he sometimes has regraduated his own violin tops after several years because the tone had gotten too bright. This also suggested that the stiffness of his violin were increasing.
  2. With the exception of the A0 peak, all of the other peaks below 1000hz appear to be slightly higher in frequency. This suggests the wood has become stiffer and/or less dense. Perhaps the varnish has gotten harder.
  3. You might find something on the construction in: Journal of the Viola da Gamba Society of America https://vdgsa.org https://vdgsa.org/cgi-bin/membership/m1.cgi
  4. I've seen a thermal image of a guitar being played but I never seen one done on a violin. Damping causes heat generation so it might be interesting to see where it occurs.
  5. Looks great! If you play the instrument for a while does it show if any areas warm up? This might be another way of doing modal analysis.
  6. Your Wed. Nov 16, 7:15am post shows the x-ray of an instrument in the Freidberg Cathedral that had a central soundpost with a metal pin in it with its end sticking into a hole in the back plate. My hypothesis is that the sound post was inserted after the body was assembled. The pin and back plate hole were used to ensure the desired location. The same thing couldn't be done on the top plate because another extending upper pin would obstruct the sound post insertion and its sliding into position. Since an upper pin couldn't be used there was no need for a locating hole in the top plate too.
  7. Does the VSA provide these links to its members?
  8. This scroll isn't quite right because it was made by coiling a round tapered tail whereas a real violin scroll uses a coiled flat tapered shape. While making a pie crust I tried to show the proper way of generating the violin spiral scroll shape as shown in the below photos:
  9. Thank you for sharing your observations. If you follow David Beard's simple rectangle proportions of the violin with the bridge dividing the length into 4 units long for the bottom rectangle and 5 units long for the upper rectangle and their width proportions of 5 units wide for the bottom rectangle and 4 units wide for the upper one then the two rectangles have the same area. The bridge is on the boundary of these two rectangles. But the balance point for even this simple two rectangle assembly is calculated to be 0.25 proportion units above the bridge line. If a violin size is used then the balance point is about 10mm above the bridge line. This is in the same direction to what you observed for real plates having more complicated shapes.
  10. Was the little hole in the center region of some Old Italian back plates close to their balance points?
  11. People don't agree on what the color of sound a good violin should be just as they don't agree on what what is the only good color or shape for cars. So I don't see this concern for proportions to be an important issue. However playability things like bridge and fingerboard curvatures, string spacings and heights etc. do see close agreement.
  12. This youtube video was recently made by three students using my instruments at the Crane School of Music in Postdam NY. My large 5 string viola that I just finished making is being played as a violin by the player on the right. https://youtu.be/pdPWWI-4gBo
  13. If you set up a radar detector in my little town you would probably find a bell curve distribution of vehicle speeds which has little relation with our 30mph speed limit law. Hence the idea "Laws are made to be broken" so that speed limit traffic fines can pay for our police. Likewise for violin "laws": They're followed somewhat but If you deviate too much the violin police fine you.
  14. I misspelled it. It should be: euphonics.org