Knots, Bends, Splices / With tables of strengths of ropes, etc. and wire rigging

by Captain Jutsum

(7). Double Luff.—Two double blocks (Fig. 98).

(8). Three-Fold Purchase.—Two three-fold blocks. Power gained—six or seven times (Fig. 99).

(9). Four-Fold Purchase.—Two four-fold blocks. Power gained—eight or nine times (Fig. 100).