Page 35 - The Complete Rigger’s Apprentice
P. 35

LASHING                      response. With these “elements of lashing,” one can
                                                               tie confidently in a wide variety of circumstances.
                  Viking raiders lashed together seagoing dragonships,
                  but their skill was almost trifling compared to that  Pulley, Frap, and Wedge
                  of their victims in Europe. At that time and through  Lashings rely on tension to do their work. A few
                  the Renaissance, cathedral builders were lashing  tight turns put on with the aid of a marlingspike
                  whole trees together steeple-high for scaffolding.  will sometimes suffice, but often the object to be
                  Smaller buildings, carts, furniture, tools, and many  lashed is heavy enough that some form of mechan-
                  other items of daily life also relied on rope for their  ical advantage must be used to provide adequate
                  construction. And it’s not as if things have changed  security. When something is to be lashed down to a
                  so much, even here in the technical vastness of the  deck, car roof, truck bed, or the like, lines are gen-
                  future. Lashings are still used for scaffolds in Asian  erally anchored on one side, passed over the cargo,
                  shipyards, in the backs of computer cabinets where  and cinched down on the other side with one form of
                  they keep bundles of wire together and out of the  advantage—the pulley. (No, not a sheave turning on
                  works, for the outriggers that anchor suspended  a pin, but the principle is the same.) Disregarding
                  scaffoldings for window washers and masons, and  friction, the two arrangements on the left in Figure
                  at the docks of the most modern superferries, where  1-18 provide a three-fold purchase. That is, the load
                  electronically aided pilots still dock by caroming off  is shared by three parts so that the part you haul
                  a bunch of pilings lashed together with wire rope. In  on gets only one third of the load. Put another way,
                  recent years, high-tech racing sailors have rediscov-  your efforts are multiplied three times; a 100-pound
                  ered low-tech deadeyes and lanyards to lash their  downward pull locks your cargo in place with, in
                  shrouds to chainplates. And every morning you lash  theory, about 300 pounds of force. I say “about”
                  your shoes to your feet.                     because we can only disregard friction in theory.
                      Far from being archaic, lashings still exist in   The line on the left in Figure 1-18 is made into
                  enough profusion to fill a volume of descriptions.  a pulley with the aid of a knot called a Trucker’s
                  No doubt some compulsive cataloger will eventu-  Hitch, of which there are many forms. This one is
                  ally do just that, but for the practical knotter it’s
                  more important to understand the varying demands
                  placed on lashings, and the basic techniques used in  Figure 1-18. Trucker’s Hitches.



























               14
   30   31   32   33   34   35   36   37   38   39   40