Generating Normal Probability Apparatus

The apparatus have mainly four parts, the first part is the main
board with the rows of nails as depicted by number in the
diagram. Second part depicted by number 2 is a hole through
which only one tablet can go to board,The third part is a sliding
strip, which can be pulled out with the help of nob. Fourth is a
drawer with eleven partitions, dividing the drawer in twelve
parts.These twelve parts of the drawer is in congruence to 6 in
a normal probability curve as shown in the diagram.