Forgive me for replying to myself, but I wanted to add this from the
letters in the February "Yachting World".

"A chairman of the Scottish branch of the Institution of Structural
Engineers once famously defined engineering as: 'The art of modeling
materials we do not wholly understand, into shapes we cannot precisely
analyze so as to withstand forces we cannot properly assess, in such a
way that the public has no reason to suspect the extent of our
ignorance.'"

-- Tom.