Neat picture.
I always find these kind of stories of great interest. The deductions and measurements and extrapolations and all that stuff read like a good Sherlock Holmes story. Real scientists doing real science is a lot of fun to read about.
related topic, also from ggg:
The Antikythera Mechanism:
Physical and Intellectual Salvage from the 1st Century B.C.
USNA Eleventh Naval History Symposium ^ | 1995 | Rob S. Rice
http://www.freerepublic.com/focus/f-chat/1191651/posts