Michael_Molnar

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About Michael_Molnar

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    Stargazer
  • Birthday 09/15/45

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    http://www.michaelmolnar.com
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    Michael R. Molnar

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  • Gender
    Male
  • Location
    Warren, NJ
  • Interests
    Astronomy, History, Optics, Great Ideas, and Interesting People.

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  1. Twisted Scroll: Caused by Stress or Drunken Luthier?

    I agree that is was carved from a poorly seasoned block or one that was still damp. Live with it.
  2. Messiah wood (again....)

    Peter, You are a scientist's scientist. This is magnificent work. Kudos to you for this tour de force.
  3. Violin geometry references

    At times, this thread reads like the minutes of a Pythagorean coven.
  4. plate tuning specs ?

    Hi Marty! Yes, she wrote these ideas, but still, I maintain that she did not practice what she preached. She essentially enabled the numerologists to bastardize a solid physics finding.
  5. plate tuning specs ?

    Maybe some others can add to this story I recall from Ed Campbell. He said that he was sitting with Hutchins one evening and remarked that when he knuckle-raps a plate he hears an F note. Her eyes brightened. but said nothing. A year later her seminal Scientific American paper on violin plate modes appeared. I can attest to the number of school physics labs on Chladni plates that were changed to include violin-shaped plates. When I ran Rutgers U. physics labs I found one of the violin plates in a box of old experiments.
  6. plate tuning specs ?

    Personally, I feel that Hutchins' contribution was that the plate vibrates in modes. Rather than asking which mode a Cremonese maker evaluated, she went off the tracks thinking that she had uncovered something that was better than what the old makers did. Then, plate tuning became numerology.
  7. Nick Allen's Bench.

    I'm getting sores on my butt waiting for the pixes.
  8. Curious about this grain pattern in spruce violin top

    That first photo is awesome, Bruce.
  9. Curious about this grain pattern in spruce violin top

    I agree with Bruce and Davide. You get that pattern on spruce when you sand with grit finer than 150 or so. Rubbing the bare spruce with a cloth will produce this too. If you scrape, you do not get this medullary ray pattern.
  10. Laser Burning Bridge Name

    There is a Mac file on the disk, but I think it's beta-ware.
  11. Laser Burning Bridge Name

    I just ran the test pattern and am very impressed. This is a miniature 2D CNC that has an incredibly easy setup and interface. I think it is pretty high quality and amazing value.
  12. Laser Burning Bridge Name

    Mine arrived this evening. I will play with it tomorrow.
  13. Laser Burning Bridge Name

    Looks good. Mine still has not arrived.
  14. Thinning varnish

    The reason I said to invert the jars is that many (reused) jars have poorly sealing lids. There is not enough oxygen in a jar to develop a large skim, but a leaking seal permits oxygen to seep continuously in and form a skim surface. I find that varnish on the jar lip or on the inside of the lid makes the jar airtight. Inverting the jar also accomplishes this. Try it.
  15. Violin geometry references

    Hi Fran├žois! I am looking at your illustration on p. 34 of "The 1690 "Tuscan" Stradivari violin" that shows an Amati superposed on the Strad PG form. Also, the illustrations of the "Tuscan" superposed on the P and PG forms can be interpreted to support your interpretation, but I see room for my claim too. Nevertheless, why do I see a tangent line connecting two curves according to the purfling and edge shape that are shown in the photo on p. 45? I am looking at the upper corner bouts where the straight tangential line is very evident. The lower corner bouts could be either: No tangential line or a small one. I am basing my ideas on the belief that the plate shape and purfling closely followed the shape of the rib garland which copied the shape of the form. So, I agree with you that garlands did not strictly adhere to the shape of the form. Mike PS: For those who do not have this book, look at several Strad posters.