1911 Encyclopædia Britannica (1911)
“ The simplest form of rowlock is a notch, square or rounded, on the gunwale, in which the oar rests; other kinds are formed by two pins or pegs, “thole pins” (thole being ultimately the same word as Norw. toll, a young fir-tree) , and by a swivel with two horns of metals, pivoted in the gunwale or on an outrigger (see Oar) . ”
