Not to forget the substantial and extremely well-documented and quantified
work done by the Crews back in Wales! See Historical Metallurgy 25 (1),
1991, p 21ff and vol. 32 (2), 1998, p49ff for further details and a first
start, and others elsewhere. Certainly a good basis to do some armchair
calculations, even if it is not nails, but bars.
Thilo
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