The traditional three ply rim is constructed of three layers of quarter inch thick flat sawn maple that are steamed, bent and glued together around a form in such a way to build up a rim structure three quarters
inch thick and the proper diameter to fit the tone ring and flange. The grain structure in this case allows for the grain to be oriented vertically. In other words the sound waves pass through the tone ring and go into the wood rim and travel straight along the wood grain into the resonator.
This is a quote from Scott Zimmerman explaining the difference between 2 different types of rims.
In the last few years, I think we've established that there is more than one kind of block rim and more than one way to orient the grain for better response. I can't wait for what the future holds in rim construction, things have heated up. Good.
"The grain structure in this case allows for the grain to be oriented vertically. In other words the sound waves pass through the tone ring and go into the wood rim and travel straight along the wood grain into the resonator."
I have never understood these two sentences, I would like to see examples of vertical-grain laminated rims. Which makers made them, and which models? Are they still made to this day? I have seen plywood and multi-ply rims, but maybe this reference is to veneers?
I'm sure there are people who know. Please help.