“…While recycling of Crimean War gunboat engines became the norm as the ships into which they were fitted literally fell apart after being hurriedly built of green timber, a number of improved types were built soon after the war (Osbon, 1965;Preston and Major, 1965;Archibald, 1968). A total of 20 of the Britomart class of improved gunboats were ordered; ten in 1859 from private shipyards and a further ten in 1861 from Portsmouth (Colledge, 1969).…”