"Durnham furnace, on the Delaware river... was built in 1727, by a company of fourteen persons, of which James Logan, (Penn's secretary,) was a member. Its first blast... the spring of 1728, and in November of that year James Logan shipped three tons of Durnham pig-iron to England. In 1770 there were two furnaces and two forges at Durnham. Much of the iron... was taken to Philadephia, in boats fashioned somewhat like an Indian canoe, and first built at Durnham, hence the term... "Durnham boats.""