MIMF

I use SDA 23A from Gold Shield distributors in Hayward. Five gallons is less than a hundred bucks. The 23A is just ethanol with 7% acetone. Gold Shield's regular denatured alcohol works also, but I don't like the smell. The SDA 23A has to be special ordered, and you can only buy five gallons in a ca...

Alan, A point of detail. I read recently on Google book the original acoustics treaty by Chladni (published in 1802 in German, 1809 for the French translatioon). He states in this book that he made his first vibrating plates experiments, with the bow, in 1785. I am surprised. Maybe it took quite a ...