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Roger Hill

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Everything posted by Roger Hill

  1. “We found a mathematical argument that explains how and why this robust effect exists with any shape within this class, so that the details of the shape are unimportant, and the only fact that matters is that there is a reversal of curvature along the saw.” Location of inflection is apparently unimportant, though its existence is everything. Enjoy https://www.seas.harvard.edu/news/2022/04/physics-singing-saw
  2. Nice work, but keep in mind that the actual arch is the centerline between the top surface which you are creating and the inside surface which you will create when you do the inside surface.
  3. a better animation is found here: http://newt.phys.unsw.edu.au/jw/Bows.html
  4. Look at the spectrum of the sawtooth wave. The string is being driven not only at the fundamental frequency, but also at all the overtone frequencies. The body doesn't need to create the overtones, it simply responds to drive force of the bridge at the overtones in the sawtooth as you would expect of any approximately linear system. Again, look here: https://en.wikipedia.org/wiki/Sawtooth_wave. Again, I will accept my flogging gracefully if wrong.
  5. I think this is correct. Drive any linear system with a pure sine wave and the output will be a pure sine wave. But unless I have missed something, In which case I will be violently flogged, what I believe is that much of the spectrum of overtones results from the fact that the violin is driven by a saw-tooth wave created by slip-stick friction of the bow with the string, and that drive spectrum of the saw-tooth is rich in higher frequency overtones. See https://en.wikipedia.org/wiki/Sawtooth_wave
  6. Thanks, Don. Good explanation. The fact that I can't hear something that (for practical purposes) is not there, is probably not good evidence that my hearing is still ok. My wife may be right.............
  7. I've lived in Colorado Springs for 50+ years and had the pleasure of hearing Zukerman, Perlman, Bell, Barton-Pine, Chang and others perform with our local symphony. Our elevation is 6,000+ feet downtown where all performed. Atmospheric density here is about 1.0 Kg/M^3 compared to 1.2 at sea level. None of the violin super-stars complained of their fiddles sounding funny due to a change in A0. All of them sounded to me just like their recordings, the most likely locations for the recordings being made was in large cities, the majority of which are at sea level. If this makes a difference it will take much better ears than mine to hear it.
  8. Well, Michael, when it comes to violins, anything that pleases you just tickles me pink . Now, where I am coming from is that you could staff the physics and mechanical engineering departments of a PhD granting university with the technical talent that posts here regularly. While I can't speak for all of that talent, I think that I speak for the majority when I say that the part of violin making that we obsess over is the acoustical part, the tone. I think that most of us probably don't give a flip about the subtle curvature of the entry to the helix of the scroll, but we can get completely engrossed about the entry of the curve of the arch as it approaches the rib, something impacting tone. In my naivete, it came as a surprise to me that professional luthiers would not have tone at the top of their list (or even on their list?) of factors defining quality of a violin. Given that that is so, I can live with it. I just won't be showing anything I make to anyone in the market, and that is no great loss to the market.............
  9. Not saying that, only that the meticulous work coming out of China equals that from 18th century Cremona in appearance. If appearance is all you value, there is a surfeit of apparent quality coming out of China. I have a hard time understanding why the comments of professionals here concern only appearance. Age has a way of increasing desirability of violins, my guess is that the better new violins from China start life having appearance equal to those that started life in Cremona 250 years ago. But would any established luthier accept them as equals? If not, why not? Doesn't tone count for something in the market made by professional luthiers, numerous comments neglecting tone notwithstanding?
  10. And based upon that, it is only a matter of 250 years or so until a good quality Chinese import has value equal to today's Strads and Del Gesus?
  11. This thread seems to confirm that professional luthiers can determine the quality of a violin with only their eyes. An amazing development of their senses and skills, ears not required.............
  12. The first plot appears to my untrained eye to have a straight line from a point on the center line of the long arch just below the lower corners to a point near the start of the trough that is at the maximum distance from the start point. Or is my imagination working overtime? I believe that our famous French contributor shows that also.
  13. Happy Birthday, David. Enjoy your youth and pay no attention to that fake news coming out of Britain that alcohol will dull your immune system and make you more likely to catch something or another, I forget just what. What do the Brits know about drinking anyway?
  14. Perhaps I have not known a large enough sample of professional musicians, but anecdotally, every one I have known has a stereo system at home. None of them are obsessive/compulsive about the quality of sound reproduced by them as are audiophiles. Rachel Barton Pine comments that she loves AC/DC. She can't be listening to them live very often.........
  15. Oh don't be! Anything worth doing is worth over doing. Combine several hobbies appealing to the insufferably anal and you are a well balanced polymath
  16. As a certified audiophile of well over 50 years, I will explain it to you: audiophiles listen to sounds while musicians listen to the music. As an example, if the music involves a conductor, musicians are listening to the conductor, while audiophiles are listening to the errors of the 2nd chair violist extending his note too long. A particular favorite sound of mine is the breathing sounds of a solo violinist on a recording where the soloist was recorded with a close microphone. Continuing with the example above, if you are listening to the conductor you are picking up all the the romance, drama, emotion, etc. that the conductor imposes on the performance, completely different from listening to sounds. On the other hand, audiophiles are looking for what changes the sound to their liking. On one of the audiophile forums some years ago one participant claimed to hear the differences of which solder was used to solder in the components of his amps, preamps, etc. He regularly wicked the old solder and re-soldered all the components with a different solder alloy, manufacturer or what ever. He would then give us learned discussions of his results in terms reminiscent of a wine critic. Tube-rolling to hear the sonic differences imparted by different (say) 6SN7 tubes, depending upon their manufacture by RCA, GE, Tung-SOL, Shuguang, whomever, whether made in 1960 vs 1962 is another favorite activity of tubeophiles. To simply hear the music is much less complex and will not subject the musician to serious discussions of whether vacuum tubes sound better with AC or DC heating of their cathodes. And because of their different demands of their audio equipment, musicians require much less sophisticated equipment and markedly less snake oil. Audiophiles obsess over new improvements to their equipment, musicians over whether Perhia or Ashkenazy gives a better interpretation of Mozart piano concertos. Nothing special in equipment is required.
  17. That true for trumpet players also, David?
  18. Played trumpet growing up. Turned down music scholarship to college because afternoon rehearsals conflicted with engineering labs. A few recommendations Best active performer Alisom Balsom: https://www.youtube.com/channel/UCGCGRYnK8HBjsl5Kowex0JQ Favorite from recent past Wynton Marsalis: https://www.youtube.com/watch?v=Gu2f_-01BdE Gets my vote for GOAT. Gave up classical music for NY jazz scene many years ago. Dearly departed Maurice Andre: https://www.youtube.com/watch?v=RLDF8OeD-hc He and Marsalis would probably vote for each other as GOAT
  19. https://www.popsci.com/story/technology/saving-the-stradivarius-sound/
  20. I have to wonder whether we should accord considerable acclaim to whoever did the thinning of the plates (Cozio's shop, Mantegazza brothers?)? If it sounded wonderful before, it probably wouldn't have been re-graduated. Are many of the celebrated violins wonderful sounding now due to efforts beyond those of the original maker?
  21. No reflections from the edge, the bevel is now set. Take your sacrificial knife to the very fine stones and see how sharp you can actually get it. It won't require much time to get an excellent edge.
  22. Can't help with making wine, but starting at about $15.00/bottle you can find plenty of stuff that I like and would enjoy in prudent quantities at any wedding I'll ever attend. In addition, after about half a bottle, you may find it quite easy to find a violin arch in the shape of the bottle, burgundies in particular..........
  23. Very gently criticizing, doesn't anybody see the geometry of that bridge structure as being approximately the shape of the shell of a violin plate? No one sees the approaches to the bridge as having the same shape of the figure 8 of the top and bottom plates? That the ridge of the violin arch from lower bout, through c bout and into the upper bout has the same shape as da Vinci shows for his bridge? Sheesh!
  24. A biblical reference, explanation from Wikipedia, not intended for you Marty, or for others who respond in genuine interest in what I thought would be obvious. I must be wrong about what is obvious, my bad. What does it mean to cast your pearls before swine? Do not cast your pearls before swine. Do not waste good things on people who will not appreciate them. This proverb is adapted from a saying of Jesus from the Gospels, “Cast not pearls before swine.” Jesus appears to be warning his disciples to preach only before receptive audiences.
  25. What is the "CG" design? I have missed something. What is "LIW"? I've missed something else. If the bridge design is used to cross a creek 50' wide it is pure genius for structural rigidity. The side arch structure will tend to oppose any stresses trying to bend it in a horizontal plane. It can twist along an axis parallel to it's length but not much. Has to be useful in the event of earthquake. Load on the bridge is transferred to the end-supports. The arches at the very ends look much like end-blocks to my eyes. The side arches and end supports look like triangles which would be the equivalent of a modern truss bridge with a triangular cross-section if looked at from the end. More rigidity. The approaches to the center of the structure look like the straight lines seen in some arches, particularly those from Robert Zuger. I'll try to spend more time casting dry flies rather than pearls.........
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