74. Chain fastening.

1'. Simple band, showing the upper side.

2'. The same, showing the under side and the knot.

3'. Tie, with crossed ends, commenced; a turn is taken under the

strands, to hold the ends of the cord.

4'. The same, completed.

5'. Bend with crossed strands, commenced, the one end being looped

over the other.

6'. The same, completed.

7'. Necklace tie, seen on the upper side.

8'. The same, seen underneath. The greater the strain on the cords,

the tighter the knot becomes.

9' and 10' are similar splices to 7' and 8' with slight

modifications.

11' shows the commencement of 13', the legs in elevation; 12' being

a front view. An ordinary band, made by several turns of a small

rope, is lapped round them and hauled taut, and then interlaced at

the ends. This done, the legs are shifted into the shape of a St.

Andrew's cross. Thus the lashing is tightened, and, for further

security, we pass the line several times over the tie and between

the spars, knotting the ends.

13'. Portuguese knot. This is a lashing for shear legs, and must be

tight enough to prevent the spars slipping on each other; the

crossing of the two legs gives a means of securing the knot.

14'. For binding timbers; a, knot commenced. Take several turns

round the timbers, and fasten the ends by passing them under the

turns; b, knot completed. The end of a round stick, m n, termed a

packing stick, should be passed under the knob, the cord being slack

enough to allow of this. By turning the stick, the turns can be

tightened to any extent; when tight, we fasten the longer arm of the

lever to some fixed point, by a rope, p q, so that it cannot fly

back. Care must be taken not to turn the stick too far, or the rope

may be broken. As the timber dries and shrinks, the lever may be

used to make all taut again.

* * * * *

Scientific American, Volume XXIV., No. 12, March 18, 1871 A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and Manufactures. · 第 55 / 194 题