The division of attention board consists of a
wooden board with a circular and triangular groove with a metallic contact
point on each. The board is wired inside so that any passage of electric
current on it from a battery can be recorded on an impulse counter. The
board is connected as its terminal to a battery. The other terminal
of the battery is connected to a metallic stylus through an impulse counter
impulse counter. Whenever the stylus passes through the metallic contact point
the counter would record once.
