times through the loop of the simple knot and then drawing it tight
(Fig. 68). They are known as "Double," "Treble," "Fourfold," or
"Sixfold" knots and are used to prevent a rope from passing through a
ring or block as well as for shortening. All gradations from the
double to the sixfold are shown in Fig. 69, both in process of making
and as they appear when drawn taut. Another very simple form of
shortening is shown in Fig. 70 and is known as the "Single Plait," or
"Chain Knot." To make this shortening, make a running loop (_A,_ Fig.
70), then draw a bight of the rope through this loop, as shown at _B_,
draw another bight through this, as at _C_ to _D_, and continue in
this way until the rope is shortened to the desired length; the free
end should then be fastened by passing a bit of stick through the last
loop, _F_, or by running the free end through the last loop, as at
_E_. To undo this shortening, it is only necessary to slip out the
free end, or the bit of wood, and pull on the end, when the entire
knot will quickly unravel. The "Twist," or "Double Chain," is made in
a similar manner but is commenced In a different way (_A_, Fig. 71).
It may also be made with three separate pieces of line, as shown in
_B_, Fig. 71. Hold the double loop in the left hand; the part _A_ is
then brought over _B_; with a half turn _B_ is crossed over to _A_,
and then proceed as in the ordinary three-strand plait until the end
of loop is reached, when the loose end is fastened by passing through
the bight and the completed shortening appears as in Fig. 72. This
same process is often used by Mexicans and Westerners in making
bridles, headstalls, etc., of leather. The leather to be used is slit
lengthwise from near one end to near the other, as shown in Fig. 73,
and the braid is formed as described. The result appears as in Fig.
74, and in this way the ends of the leather strap remain uncut, and
thus much stronger and neater than they would be were three separate
strips used.