PirateofCapeAnn,
I believe you are incorrect in your definition of left-laid
line or wire rope. Left laid, or back-laid rope is used in only two areas I am aware of; cable-tool well drilling
rigs and elevators.
Lang-laid wire rope is rope where the wires are twisted in the same direction as the strands of the wire rope. It makes for an extremely flexilbe wire rope that is neither as strong nor as durable as regular lay.
An example of how wire rope is described:
right regular lay, the wires and strands are laid in opposing directions with the strands laid up to the right.
right lang lay, the wires and strands are laid in the same direction with both being to the right
etc...