Marty Kasprzyk

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About Marty Kasprzyk

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    Enthusiast
  • Birthday 06/02/1945

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

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  1. Nathan Giem was one of the VSA violin judges at the last conference. I heard him say that he already has a pretty accurate impression of a violin just by tuning it.
  2. It would be more helpful if the actual string lengths were discussed rather than the viola's body sizes.
  3. Has anybody had a chance to see the new book: "Antonio Stradivari.Le chitarre- The guitars" by Gianpaolo Gregori, English translation by Cecilia Gregori il mio libro self publishing, 2019 ISBN 978892358171 It has on its cover the outlines of five Stradivari guitars. The book might give us some insight into how these shapes were generated.
  4. Hi Don, I agree that this would minimize static loads and would produce the least amount of deformation and probably not produce much sound output. Do you think makers hundreds of years ago were using curved arched plates to get the most deformation rather than the least?
  5. I also learned that Leonardo liked playing the lyra da braccio.
  6. I found this on the internet regarding the building of Brunelleschi's amazing masonry dome in Florence: Another of these crucial elements is the lantern, on top of which rests the bronze ball built by Verrocchio in 1472. To position the ball they used machines invented by Brunelleschi. The young Leonardo da Vinci figured among the apprentices that helped in this difficult operation.
  7. I agree the graceful sloped inflection shape of a Burgundy bottle is most attractive and its wine's full luscious velvety taste follows this visual image. But can't afford a bottle of old Burgundy and my attempts at making pinot noir were the same as my violin making.
  8. I read somewhere where Roman engineers had to stand underneath the stone arches they designed and had built when the supports were removed to leave the free standing arch. Perhaps MIT students should have to do something similar.
  9. Thanks for the reference and helpful insight. I'm also having trouble making some good wine for a wedding.
  10. I disagree. The violin's arch is supported by the corner blocks which prevents it from stretching out sideways and collapsing --da Vinci's bridge arch is supported by the bridge abutments that do the same thing.
  11. What does that mean "casting dry flies rather than pearls...." I know about casting dry flies. What about pearls?
  12. They're beautiful! Do you always use one piece backs? Do the three different sizes sound much different?
  13. Strad's pochette has examples of long, not quite straight, gradual and smooth inflections between the tighter curves of the bouts and corner points. I don't think it is practical to generate these kind of shapes with circles and straight lines. How did Strado draw his pochette? Strad pochette. small, jpg
  14. I wouldn't dismiss 'French curves' as "merely". I found this on a a French curve internet search: "French curves are actually Euler spirals which produce a straight line as the limit approaches zero and the circle as a limit approaches infinity. In other words it creates a curve that will smoothly link a straight line to a circle which is exactly what draftsmen use a french curve to do." This seems like the nearly straight line transition between the upper and lower bouts of a guitar with its middle bout and a photo of an Euler spiral is attached. So an Euler spirals are better than circles for drawing guitars and violins. The German Ludwig Burnester is credited with the invention of "French curves" and it is interesting that he was studying the motions of machine linkages. The human body's arm-wrist-hand-fingers is also a system of several linked moveable parts and this allows a complete freedom of motion and which gives us some survival benefits. An artist uses this movement freedom to draw smoothly flowing curves like spirals. If you've ever had the misfortune of having a broken hand or wrist in a cast you know how hard it is to do cursive writing or draw smoothly. If everything down from the shoulder is in a cast you are pretty much limited to just drawing big circles. Sort of like using only a compass.