69. Wooden shell in section.
70. Crossed fastening. The turns of the cable, passing in front of the
post, B, are crossed at the back of C, in the direction 1, 2, 3, 4, 5,
6, 7, 8, the end, 8, being secured to the cable.
Scientific American, Volume XXIV., No. 12, March 18, 1871 A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and Manufactures. · 第 52 / 194 题