16 Copper* Sheathing^ [July, 



examined by Sir H. Davy, the proprietors, and various other 

 persons. JSvery part of her bottom was bright and clean with- 

 out a single adhesion of any kind, and as far as could be judged 

 firom the smoothness and appearance of the copper, it had not 

 been at all worn by any chemical corrosion. The iron, which 

 "Was about an inch and naif in thickness, is considered a sufficient 

 protector for two voyages more. 



2. The Elizabeth yacht, belonging to the Earl of Darnley, was 

 protected by two pieces of malleable iron in the stern, in May 

 last, equal to about ^i— ^^ ^^^^ surface of the copper. After 

 being employed in sailing during the summer, she was examined 

 in November, when her oottom was found free from adhesions 

 of any kind, and apparently untouched. The copper was bright, 

 and even the nails not tarnished. In the course of the summer 

 a few small barnacles had adhered to the rust of iron, which were 

 easily and immediately washed off; but no weed or shell fish 

 had ever fixed on the copper, which appeared in the same state 

 as when she left the dock. 



The following exslmples we owe to the kindness of Dr. Traill : 



The ship Huskissoji, belonging to Mr. Horsfall, was lately in 

 dock after a voyage to and from Demerara, where she lay some 

 weeks, in a river remarkably favourable to the adhesion of para- 

 sitical animals and weeds ; yet, when I examined this vessel, 

 her copper appeared perfectly clean, as far as it could be seen, 

 when she was purposely set by the s^erw in unloading, in order to 

 show her copper at the bows as low as possible. The Captain 

 stated that before coming into port, while yet in clear water, he 

 had seen her bottom even to the keel ; and it seemed to him 

 quite clean. This ship was defended by two bars of malleable 

 iron bolted along the sides of her keel by copper fastenings, ' 

 which covered about -j-^ of the surface of her copper. 



The Elizabeth, a vessel defended exactly in the same manner, 

 with metals in the same proportions, had made the same voyage. 

 Both had been newly coppered when they last left Liverpool ; 

 and the Elizabeth's copper appeared equally clean as that of 

 the Huskisson when unloaded; but as she did not enter a 

 graving dock, we cannot absolutely say whether she was quite 

 clean, especially as the copper of the Dorothy (about to be men- 

 tioned) appeared equally so, until she was seen in the graving 

 dock, when the flat part of her bottom was found to be quite 

 covered with barnacles. The copper of the Huskisson, there is 

 reason to believe, was peifedlij clean, as was proved in the next 

 case, 



The ship Dee, — A very large vessel belonging to my relative, 

 Mr. Sandoach. This ship was newly coppered about twelve 

 months ago, and a bar of malleable iron, about ^ of an inch 

 thick; and three inches broad; was fastened on each side of the 



