Moulded concrete block for ornamental garden wall

摘要

The block (1) is rectangular and has a central tongue (5) on one surface (2) parallel to its visible ones (3,4). On its other horizontal surface (6) are two tongues (7,8), forming between them a groove (9), in which the first tongue has a close fit. These tongues extend from the tail end (10) to a point (11) short of the head end (12) so as to give a length equal to the offset between blocks one above the other plus the distance between a visible side (3) and the central tongue. The central tongue can be on the block top surface, and the parallel ones on the bottom surface, these do not extend as far as the visible surfaces.