Any greenhorn would have the task of "learning the ropes" which should lay the matter to rest, assuming that "lines" were a subgroup of ropes.

"Jimmy Green" is another intriguing name for a sail somewhat more forward than the "Ring Tail." C. Fox Smith has a lovely poem which notes many of these arcane sails and the fact that so few remain (back in the late 1920's) who know their names and their function.

Cheerily,
Charley Noble