57. Fastening by a loop. This can be tied or untied without loosening
the loop itself. It is made by following, towards the longer loop, the
direction as numbered 1, 2, 3, 4, 5, and is terminated by the loop, 6,
7, 6, finally passing it over the head of the post, A. This knot holds
itself, the turns being in opposite directions. To untie it, we slack
the turns of the cable sufficiently to again pass the loop, 6, 7, 6,
over the post, A, and turn the ends in the contrary direction to that
in which they were made (as 5, 4, 3, 2, 1).