主权项 |
1. A block for forming a wall when stacked with a plurality of other blocks, said block comprising:
a first plate formed from a cement mixture, the first plate having an inside face, a top end, a bottom end opposite the top end, a first end, and a second end opposite the first end, wherein the top end of the first plate has a tongue or groove and the bottom end of the first plate has a tongue or groove substantially complementary to the tongue or groove of the top end of the first plate; a second plate formed from a cement mixture, the second plate having an inside face, a top end, a bottom end opposite the top end, a first end, and a second end opposite the first end, wherein the top end of the second plate has a tongue or groove and the bottom end of the second plate has a tongue or groove substantially complementary to the tongue or groove of the top end of the second plate; and a spacer operable to attach to the inside face of the first plate and the inside face of the second plate and maintain the inside face of the first plate at a predetermined distance from the inside face of the second plate. |