| 摘要 |
<p>The walls are erected from rows of parallelepipedal blocks, the blocks of each of the successive rows being fitted into one another by means of a dovetail joint (4, 5), a vertical projection (4) being provided on one of the small faces of the blocks and a complementary re-entrant angle (5) being provided on the opposite face, ribs (6) with their complementary grooves (7) being provided on the corresponding longitudinal edges of these blocks, so that the blocks of one row can fit on to those of the lower row, the blocks not being joined together by any mortar. <IMAGE></p> |
