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The metal sheathing of Cutty Sark, made from the copper alloy Muntz metal. Copper sheathing is a method for protecting the hull of a wooden vessel from attack by shipworm, barnacles and other marine growth through the use of copper plates affixed to the surface of the hull, below the waterline.
The Inspector General's office was responsible for the introduction at Portsmouth of a plant for the rolling of copper plates for sheathing ship's hulls and for forging-mills for the production of metal parts used in the construction of vessels. They also introduced similar modernisation at the other Naval dockyards in conjunction with M I ...
Satisfied that the copper had had the desired effect, the Admiralty introduced copper sheathing on a number of frigates. In 1776 Alarm was resurveyed. It was soon discovered that the sheathing had become detached from the hull in many places because the iron nails which had been used to fasten the copper to the timbers had been "much rotted".
Sacrificial anodes made from iron attached to the copper sheath of the hull below the waterline dramatically reduced the corrosion rate of the copper. However, a side effect of cathodic protection was the increase in marine growth. Usually, copper when corroding releases copper ions which have an anti-fouling effect.
System map of the Redruth & Chasewater Railway. Prior to the nineteenth century, much mineral extraction had taken place in the Cornish peninsula, but this had been limited by the non-existence of industrial methods; thus the depth to which shafts could be sunk, and at which water inundation overwhelmed the workings, and the cost of transporting extracted minerals to market, all proved ...
Alongside a smithery were a copper-smelting furnace and refinery, and a steam engine which drove a rolling mill and tilt hammers. Begun in 1801, these facilities were for recycling the copper sheathing of ships' hulls. In 1804 the works were extended to accommodate machinery for the rolling of iron to make bars and bolts.