| 摘要 |
A pyramidal brick has a body in the form of a parallelepiped and is made of clay or silica mixture of a given composition. On two longitudinal surfaces of the body three pyramid-shaped protrusions are made, which alternate with two adjacently arranged surfaces, where three depressions of pyramidal shape are made, and on the end surfaces of the body there are made: a protrusion in the form of a pyramid from one side and a depression from the other side also in the form of a pyramid, whose ribs do not coincide with the corners of squares, while the length of body is equal to 3a, wherein a - width or height of the body without the pyramidal protrusions and each pyramid is turned for an angle &bgr; = 45° relative to the longitudinal ribs of the body. |
