| 单词 | skew-back |
| 释义 | skew-back
[f. skew n.3 or v.2 + back adv.]
1. Arch. The springing-line of an arch; the sloping surface on which either extremity of an arch rests; a course of stone or brickwork, an iron plate, etc., immediately supporting the foot of an arch.
1703Moxon Mech. Exerc. 279 According to the breadth of the Piers between the Windows, so ought the Skew-back or Sommering of the Arch to be. Ibid. 280 The line AC, which is vulgarly called the Skew-back for the Arch. 1725W. Halfpenny Sound Building 36 Set off the Skew-Back from f to E, and..I will be the Centre to which the Skew-Backs..are directed. 1837Civil Eng. & Arch. Jrnl. I. 34/1 The arching for the support of the stairs is to be..springing from cut skew backs, and properly keyed in. 1842Penny Cycl. XXII. 87/1 A plate of cast-iron is usually laid upon the stone skew-backs, extending the whole width of the bridge. a1878Sir G. Scott Lect. Archit. II. 40 The arches are turned in Roman bricks,..a steep skewback being formed for their springings.
b. A ring on the inside wall of a blast-furnace, by which the area is diminished.
1884Knight Dict. Mech. Suppl. 820/1.
2. Mech. A cap or other casting made to receive the end of a diagonal rod or brace.
1884Knight Dict. Mech. Suppl. 820/1.
Hence skew-backed a. (see quot.).
1905Bond Goth. Archit. 259 The upper surface of the top springer..against which the first voussoir of the real arch..starts, is said to be skewbacked. |
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