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threads are for the purpose of preventing twisting of the sail. The sail is of some light soft material that is very pliable in the breeze. Some use silk, others soft cotton, and some paper. I used a Chinese tissue paper sail and found it very satisfactory; it lasted several seasons. The strong way of the paper should be put on up and down. The sail is pasted or sewed to the yard arms. The sail line is a piece of linen thread that is fastened to the middle of the upper yard arm, passing thru a loop made of small wire, u, which is lashed to