The endpin is getting the vibration energy mainly through this route(TailPin-TP-BR) not through lower-bouts.
When the vibration of tip of endpin is restricted at one point on the floor, the rebounded energy will probably come back to the tailpiece through this propagation highway. Getting energy, tailpiece can probably keep the vibration powerfully and clearly for 3 seconds or more.
(2)An another important peculiarity was found at the upper part of tailpiece(TP1). TP1 shows a characteristic vibration beets for C note(66Hz) that keeps constant(/flat) 4-beat. This vibration is supposed to be caused from structural reason.
In this case, it is shocking to say, the 4-beat vibration is also observed broadly in bridge(BR), and partially in the top plate(T-3, T-2). This particularly flat vibration from the tailpiece seems somehow affecting the cello body.
(When we look back at the "Label: 20.Vibration Video(slow-motion) -> Tailpiece", tiny 4-beat vibration can be seen on the string between bridge and tailpiece.)
(3)In my former posts, the lower-bouts showed a tendency of fading out rather in a short time at the case of 'on the floor'. Besides this, the lower part of top plate(T-4) also slightly weakens the vibration at around 3 seconds. These phenomena probably suggest some shrinkage of resonance at the lower hemisphere of cello body.
[ 1/13/2017 ] Labels: 47..Propagation