The seam in a sail where cloths which run in two directions are joined. Triangular sails, such as staysails and jibs (and occasionally Bermudan mainsails), are normally made with the lines of the cloths running in two directions; for example, the upper cloths of a jib might run at right angles to the leech, and the lower cloths at right angles to the foot. The mitre seam usually forms a strengthened narrow cloth running diagonally from the clew to some point on the luff. Different sailmakers have their own ideas of the best method of setting the cloths and the mitre seam, but the latter is usually arranged to run more or less in line with the sheet so as to distribute the strain of the sheet evenly throughout the sail cloths.
Subjects: Maritime History.