Calculationsnormally begin with an empty or cleared abacus. Place the abacus flat on thetable in front of you, then tilt the frame toward you as shown in figure (A).Gravity pulls all the beads down. At this point only the lower beads have beencleared away from the beam as shown in figure (A).
Now, place the abacusback onto the table and hold it with the left hand. Then, using the back of theright index finger, make a sweeping motion from left to right between the topof the beam and the bottom of the upper beads as shown in figure (B). Thisforce the upper beads up away from the beam. When none of the rods shows anyvalue, this is what is known as a cleared abacus.
Before beginning,the Abacus is “Cleared” by :
With no beadtouching the bar the Abacus now reads ‘Zero’. Beads values are calculated only whenthey touch the Bar.