51. Tie to pins: a, the pin; b, small cords fixed by a cross tie.
52. Cleet, fixed to the "rail," either with screws or nails, to which
the lines are belayed.
Scientific American, Volume XXIV., No. 12, March 18, 1871 A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and Manufactures. · 第 42 / 194 题