Oakum
Oakum is a preparation of tarred fibre used to seal gaps. Its main traditional applications were in shipbuilding, for caulking or packing the joints of timbers in wooden vessels and the deck planking of iron and steel ships; in plumbing, for sealing joints in cast iron pipe; and in log cabins for chinking. In ship caulking, it was forced between the seams using a hammer and a caulking iron, then sealed into place with hot pitch.
William Champion (metallurgist)
Because of the American War of Independence, the price of tar greatly increased, which was used at the time as a sealant on ships. On 29 April 1780 an advert appeared in Sarah Farley's Journal offering for sale a process of making English tar, from the estate of the deceased William Champion. Later, a tar works was established within Bristol Harbour.