| 释义 |
sirmark, n.|ˈsɜːmɑːk|
Also 9 surmark.
[f. mark n.1 The first element is prob. sur- over, above, although sir- is the earlier and more usual form.]
One or other of several marks made upon a mould to indicate where the respective bevellings are to be applied to the frame-timbers of a vessel.
α1664E. Bushnell Compl. Shipwright 15 Make Sirmarks to them. 1711W. Sutherland Shipbuild. Assist. 26 Then hang up a Ribbon at the Floor Sirmark. Ibid. 52 In the Length, 3, 4, or 5 Sirmarks are made, according to the Length of the Piece. 1797Encycl. Brit. (ed. 3) XVII. 401/1 The lowermost diagonal..which is named the lower sirmark, at which place the bevellings are taken for the hollow of the floors. 1833Richardson Merc. Mar. Arch. 4 Length of midship floor 10 feet 3 inches from sirmark to sirmark. 1879Cassell's Techn. Educ. IV. 190/1 A line or batten is stretched from some point in the middle-line of the keel to the corresponding heads or sirmarks on opposite sides.
β1846A. Young Naut. Dict. 250 The points, called surmarks, where the respective bevellings are to be applied to the timbers. 1894Outing XXIV. 21/2 A cross..on the staff line and also on the stem..called the surmark.
Hence ˈsirmark v. ? Obs.
1664E. Bushnell Compl. Shipwright 16 The Moulds being made and Sirmarked to the body of the Vessell. |