| 摘要 |
Adjacent bricks (1, 2) are interlocked by knee joints formed by hollow (3 and concave (4) end faces. The half brick (2) is square ended. Bricks (1) have two or three protrusions (5) that are cylindrical or of truncated cone shape. These partially engage matching holes (7) in the next course. Dimensions A=B=R+T where: A is the distance between centre lines of the protrusions (5) on one brick; B is the distance between protrusions on adjacent bricks; R is the radius of curvature of the concave end (4); T is the shortest distance from the protrusion (5) to the hollow (3).
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