Blistering barnacles, what's that doing in here?
This single 11cm-tall barnacle was taken from the hull of an Indiaman (trading ship) and has other, smaller barnacles growing on it.
The gradual covering of hulls in barnacles and weed growth could severely affect the perfomance of sailing ships. The use of copper, as on Cutty Sark's hull, could reduce but not eliminate the process.
The date of this barnacle is not known but it is probably from the 19th century and was perhaps kept as an unusually striking example.