Abstract: There is taught the use of a steel angle section suitably fixed onto the inside surface of a panel. Each panel has at least one angle section mounted relatively near the upper end but can be mounted anywhere thereon. One leg of the angle section is disposed perpendicularly to the panel to form a flange. The depending of the flange has its outer surface preferably disposed flush with the surface of the panel. The panel is provided with an opening in the region behind the depending leg. In addition, the depending leg is provided with a vertical slot in which a key member is disposed to move vertically within the slot. To the key member is pivotably mounted a swing arm or tie plate which has an elongated slot at its other end. Through this slot at the other end, a pin is fitted to mount the tie plate to the building. Vertically disposed and threaded through the upper leg of the angle section is a bolt whose end bears on the key member to provide vertical adjustment.

Abstract: A building block made of concrete or the like comprises a front face, a back face, a top face, a bottom face, and a pair of side faces. The top face has a convex angular first surface with a vertex extending between the side faces, and a concave angular second surface with a vertex extending between the side faces. The concave second surface lies between the convex first surface and the front face of the block. The bottom face has a concave angular third surface with a vertex extending between the side faces, and a convex angular fourth surface with a vertex extending between the side faces. The convex fourth surface lies between the concave third surface and the front face. The convexity of the first and fourth surfaces matches the concavity of the third and second surfaces, respectively, thereby forming a double interlock, namely, an interlock between the first and third surfaces and an interlock between the second and fourth surfaces.