> Here's my question. In the 2nd piano example, maple and mahogany laminations: > since the specific gravity of mahogany (swietenia macrophylla= .51) is actually > less than that of maple (.63), this bridge is actually less dense than the stand > alone maple, assuming absolute density is what we are looking at. > > To my mind, this doesn't jive with the straight-up absolute density > explanations...unless... the effect of increased density occurs as much from the > layers of non-uniform densities introduced by layering different species (with > differing densities), as from the > actual absolute densities of the woods. > > Does this make any sense? > > Jim I I wondered when someone would bring that up. What's the specific gravity of the cured glue used in laminating the bridge root and gluing on the cap? I suspect bridge number two is still heavier than bridge number one. I don't in any way buy some magic effect of apparent increased density from non-uniformity of less dense material. Ron N
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