FIGURE 62 (b). -- Net is unfolded over frame with embrasure opening -- if any -- toward enemy. It is stretched tight and fastened to perimeter wire with pieces of No. 16 wire, about 2 ft. 6 in. long, at 3-ft. intervals. The embrasure is held closed with a 'quick-release" device (fig. 67) so that a pull on the rope will open the entire embrasure.