The Lego domino row builder machine works by having a magazine of dominoes that is dragged along the table and a slider that moves back and forth sliding one domino out of the magazine at a time. All along, the machine is driving forward, which causes the released dominoes to be spaced out.
The key idea that makes the machine work is that the magazine is just a row of dominoes dragged along the table.
More about Lego domino row builder whit some instruction how to build check here!
nice post. thanks.