Building block construction with spacer and method of fabricating the block

Claim 1

IN A BUILDING CONSTRUCTION, A PAIR OF SUPERPOSED BLOCKS EACH HAVING GENERALLY PARALLEL UPPER AND LOWER FACES AND FIRST AND SECOND PAIRS OF LONGITUDINALLY-SPACED DOWEL HOLES OPENING THROUGH SAID FACES, RESPECTIVELY, EACH HOLE OF ONE SAID PAIR BEING IN VERTICAL ALIGNMENT WITH A CORRESPONDING HOLE OF THE OTHER SAID PAIR, A DOWEL PIN COMPRISING A SHANK SIZED TO HAVE A SMOOTH FIT WITHIN SAID HOLES AND A PLURALITY OF COPLANAR ARMS INTEGRAL WITH AND EXTENDING RADIALLY FROM THE MIDPORTION OF SAID SHANK, EACH SAID ARM HAVING A DIAMOND-SHAPED TRANSVERSE SECTION IN PLANES PARALLEL TO SAID SHANK DEFINING UPPERMOST AND LOWERMOST EDGES EACH IN LINE CONTACT WITH THE CORRESPONDING FACE OF A RESPECTIVE ONE OF SAID BLOCKS, THE VERTICAL DISTANCE BETWEEN SAID EDGES BEING FIXED AND PREDETERMINED, AND ACCURATELY DETERMINING THE SPACING BETWEEN SAID BLOCKS, ALL SAID ARMS OF EACH SAID DOWEL PIN LYING IN A COMMON PLANE NORMAL TO THE AXIS OF THE SHANK THEREOF, AND MORTAR BETWEEN AND UNITING SAID BLOCKS.