| 摘要 |
<p>A structure formed by connecting together three or more timber wedge sectors produced by cutting acute-angled wedge sectors from a log so that: (a) the parts of the wedge sectors that were closest (8) to the outside of the log are closest together, (b) the parts of the wedge sectors that were closest (7) to the centre of the log are furtherest apart, (c) the angles between the planes dividing the angle formed by the wedge sectors radial faces are generally equal, (d) the planes dividing the angle formed by the wedge sectors meet generally at the centre (15) of the structure.</p> |
