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>John Fincham, "A History of Naval Architecture" page >97, gives the following additional costs involved in >replacing the iron bolts below the waterline with >copper bolts. >First Rate £2272 - 2nd Rate 90 £2018 - 3rd Rate 74 >£1559 - >3rd Rate 64 £1178 - 4th Rate 50 £872 - 5th Rate 44 £618 >5th Rate 36 £528 - 5th Rate 32 £ 476 - 6th Rate 28 £390 >6th Rate 24 £337 - 20 gun £279 - Sloop £210 >- Brig £158. These were ordered to be fitted October >1783. >Problem not solved until after 1823. >Bob Legge. >>> >>> >>>I will search Boudriot, i remember he give quite a >lot >>>of infos about coppering >>>What i remember now is : >>>- bronze bolts to attach the copper plate to the hull >>>- COST : around 10% of the cost of the ship !!!! >> >>Thanks gentlemen! This is just about everything I >>needed to know. Cy says the cost of coppering a >>British 74 was ƒ1500. Looking at Winfield, who does >>list the cost of ships (I can't find any mention of >>the cost of coppering, but it may be somewhere in his >>four books), the cost of a 74 seems to have usually >>been around ƒ55-75,000. This means that the cost of >>coppering would have been from 2-3% of the cost of the >>ship. Didier says about 10% of the cost of a French >>ship. I accept both percentages as valid and this >>would seem to indicate the British manufacturing and >>metallurgy was more advanced at this time. Jan Glete >>has said that British metallurgy with respect to the >>casting of iron cannon was probably second only to >>that of Sweden in the late 18th Century and well ahead >>of the other non-scandinavian countries in Europe and >>so it would not surprise me if they could also work >>more cheaply with copper. >> >>I would have guessed that copper sheets would have >>been thicker -½" to 1". This proves, among other >>things, that I am no metallurgist :-). >> >>Thanks again, >> >>John Tredrea

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