The drawings are indeed very good!
Only took me this long to find it given the number...
On Oct 15, 2009, at 1:54 PM, George Brock-Nannestad wrote:
> Hello, just completing the references:
> British Patent 3393/1901 for a corrugated diaphragm
> British Patent 9418/1899 for a violin and similar stringed instruments
> US Patent 644,695 is the corresponding US patent
> The drawings in the earliest patents are very good.