342 
Sir Humphry Davy's further researches on 
and submuriate of copper, and with a number of long weeds, 
principally fuci, and a quantity of zoophytes, adhering to 
different parts of the bottom ; so that this first experiment 
was highly satisfactory, though made under very unfavour- 
able circumstances. 
The only two instances of vessels which have been recently 
coppered, and which have made voyages furnished with 
protectors, that I have had an opportunity of examining, are 
the Elizabeth yacht, belonging to the Earl of Darnley, and 
the Carnebrea Castle, an Indiaman, belonging to Messrs. 
WiGRAM. The yacht was protected by about part of 
malleable iron placed in two masses in the stern. She had 
been occasionally employed in sailing, and had been some- 
times in harbour, during six months. When I saw her in 
November she was perfectly clean, and the copper appa- 
rently untouched. Lord Darnley informed me that there 
never had been the slightest adhesion of either weed or 
shell-fish to her copper, but that a few small barnacles had 
once appeared on the loose oxide of iron in the neighbour- 
hood of the protectors, which however were immediately 
and easily washed off. The Carnebrea Castle, a large vessel 
of upwards of 650 tons, was furnished with four protectors, 
two on the stern, and two on the bow, equal together to 
about of the surface of the copper. She had been pro- 
tected more than twelve months, and had made the voyage 
to Calcutta and back. She came into the river perfectly 
bright; and when examined in the dry dock was found 
entirely free from any adhesion, and offered a beautiful and 
almost polished surface ; and there seemed to be no greater 
wear of copper than could be accounted for from mechanical 
causes. 
