| 摘要 |
The brick has a plane upper surface (2) and a plane lower face (3) parallel and identical to the upper face. The inner face (4) is square or rectangular and the outer face (5) is also square or rectangular and has a width greater than that of the inner face (4). Two non- parallel lateral faces (6, 7) join the inner and outer faces. The inner face is offset with respect to the straight line passing through the centre (9) of the outer face and extending perpendicular to the outer face. In other embodiments the lateral faces may be curved. <IMAGE> |
