(pron. trennels or trunnels),
long cylindrical pins of oak used to secure the planks of a wooden ship's sides and bottom to its timbers. Holes were bored with an auger through the planks and into the timbers, and the treenails driven home with a mallet. Their diameter was 2.5 centimetres (1 in.) for every 30 metres (100 ft) of a ship's length; thus a ship with an overall length of 46 metres (152 ft) would use treenails 3.8 centimetres (1.5 in.) in diameter.
Subjects: Maritime History.