Upper Dials. Consists of eight individual dials with black and red digits. Shows the multiplier in multiplication, and the result of division.

Lower Dials. Consists of sixteen individual dials, showing the result of addition and multiplication, the remainder in subtraction, and the dividend in division.

Dials Clear-out Crank. Rotate forwards one turn, stopping at bottom, to clear out upper dials. Backwards for lower dials.