Figure 17.—Lashing of rafters to ridgepole:

a, the sennit working hank is first fixed to one of the rafters (1) just below the rafter junction at (2), with the usual slip knot shown in the scaffolding. The free end of the sennit is passed around the right rafter, tied over its standing part with an overhand knot, and drawn taut. The braid is drawn tightly to the left around the ridgepole (3) to the right with a transverse turn across the under surface near the end edge and brought up on the right over the ridgepole, keeping close to its edge. It crosses its starting point and passes backward over the left rafter in the fork formed by the upper end of the right rafter. From here the braid crosses over the top of the ridgepole to reach the lower surface on the far side of the right rafter. page 31b, It makes a transverse turn to the left to the far edge of the left rafter, which shows the rectangular space on the under surface of the ridgepole thus defined. The braid pases upwards over the ridgepole and crosses the right' rafter in the right fork formed with the upper end of the left rafter. When it reappears at the near edge of the right rafter it is back to its original starting place, c, The movements are repeated until there are two sets of four transverse turns on the under surface of the ridgepole. The braid is brought back to the point where it would make a fifth near transverse turn but instead of doing so it makes a diagonal turn to the far edge of the right rafter. d, from there it makes transverse turn over the right rafter, and appearing on its near side, it makes a diagonal turn across the under surface of the ridgepole to the far edge of the left rafter. A transverse turn over the left rafter brings it to the near edge where it started the diagonal turns. The crossing of the two first diagonal turns forms the center of the lozenge. All diagonal turns must now follow a regular sequence, first on the near side, and then on the far side of the first crossing turns from either side. Five turns form the complete lozenge. The figures at the sides show the order in which the turns were made. All lozenges are formed in this way, and if the turns are laid closely to the outer side of the preceding turns both below and above, the neat lozenge develops itself.