Page 727 Advertisement 4

Progress, Volume XV, Issue 6, 1 February 1920, Page 727

being formed with a flange of uniform depth and projecting at right angles with the surface of the tile. The tile is therefore of channel-form in cross section, and its said taper, or reduction in width, is such as to permit of the narrow end of one tile being inserted between the flanges at the wide end of another tile to such a depth as to provide the maximum overlap required in the construction of a roof. ' , Building Slab, Plate, or the Like —A patent, No. 42019, has been taken out by H. K. Dyson, of London, as per drawing. The invention lies in the construction of slabs, plates, or the like with reinforced ribs formed of discrete materials on one or both sides thereof and disposed transversely to each other, which ribs form a coffering. The slabs, plates, or the like are formed with depending ribs round their four edges, and with or without intermediate ribs, forming square or. rectangular inverted shallow boxer, or depressions on the under side thereof. The depressions may take the form of double h a '////////////SZ777Z 1