| 单词 | jack rafter |
| 释义 | > as lemmasjack rafter jack rafter n. Roofing any rafter of a length less than that of the slope of a roof; esp. one of a number, gradually decreasing in length, set at intervals along the edge of a roof and intersecting with a hip rafter (hip rafter n. at hip n.1 Compounds 5b); cf. jack timber n. ΘΚΠ society > inhabiting and dwelling > inhabited place > a building > parts of building > framework of building > [noun] > roof-beam pan1284 roof-tree1321 wiverc1325 sile1338 wind-beam1374 bindbalkc1425 trave1432 purlin1439 side-waver1451 wind-balk1532 roof beam1551 post1567 crock1570 spercil1570 collar-beam1659 camber1679 top-beam1679 camber-beam1721 jack rafter1736 hammer-beam1823 tie-beam1823 spar-piece1842 viga1844 collar1858 spanner1862 cruck1898 1736 B. Langley Anc. Masonry Dict. sig. gv Jack-Rafters, the short Rafters in the end of a hipp'd Roof. 1741 T. Langley Builder's Jewel 24 Which fill up with small and Jack Rafters at Pleasure. 1859 W. Bell Carpentry made Easy ii. 72 Since the pitch of the jack rafters is the same as that of the common rafters, the longest jack rafter, the upper end of which rests against the end of the ridge pole, is of the same length as the common rafters. 1918 A. I. Frye Civil Engineers' Pocket Bk. (rev. ed.) xlvi. 807 The strength of the sheathing will determine, within certain limits, the spacing of the jack rafters. 2010 R. Osborn Framing House viii. 166 Each jack rafter terminates at the header. < as lemmas |
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