Emilg

Aha!

Figure 1 just shows what the sizes A1, A2, B1, etc. stand for (the sides of the wedges), so it applies to both wedge 1 and 2.

C is the speed of sound of the spruce, measured by Don Noon's (ridiculous easy ) way by tapping one end of the wedge, looking for a sensible frequency peak = F, multiplying by 2x the length L. C is in m/s. I understand C for spruce is usually between 5000 and 6000 m/s, so 7000 m/s is pretty high. The radiation ratio for wedge 1 would be 7062 / 450 = 15.7 which is high too. (so good according to some) Wedge 2 has a RR of 5508 / 460 = 12, which in turn is quite low. edit: that is when those C's do belong to wedge 1 and 2 in the right column.

Both wedges are on the heavy side, but not nearly as heavy as Henry's 0.52. But i believe even some Strads had 0.46 tops. C for wedge 1 seems pretty high, for wedge 2 normal/lowish? What is meant by ring M and Hz/cm3?

that's it! it was quite dense wine as i remember, but fully seasoned

Last time i asked for the spruce density from a supplier, he replied: 10-12%

i think you're right i should have looked further

you can get them much cheaper! https://www.latestcore.top/fine-old-czech-violin-by-frantisek-bocek-p-9734.html

Great, let us know how it turns out! I wonder where the B1's end up...

Hi Henry, M5 is actually pretty easy to see in the spectrum as a big peak, as long as you hold the plate between thumb and finger in the right spot (node) and knock at the right place (anti-node). You can hear a clear full ringing of the plate. (but that's not why it's called the ring mode ) my guess is that the M5 is somewhere in the low 300s

that is some incredibly stiff wood then! i'll leave it up to the experts like Don and Peter how to proceed with that

thta's pretty heavy wood, so maybe the SP area can be thinned some more to around 2.5mm

you probably mean 330 Hz, with BB it will be around 370 Hz at 76 g .. so there's a bit of room left what was the density?

yes i've seen it a couple of times, nice demo's how do you measure the B's, or do you hear them?

Hi Doug, i had used cork for string cleaning a couple of times, but then i read this: http://www.warchal.com/faq/cleaning_using_cork.html