ADDITION and SUBTRACTION are operated in the SAME SLOTS

ADDITION  (w. BLACK Figures  on clear background):
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When the figure is in the RED region PULL DOWNWARD
When the figure is in the WHITE region PUSH UPWARD
                with 10s-Carry in the UPPER REGION

SUBTRACTION (w. WHITE Figures on black background):
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When the figure is in the WHITE region PUSH UPWARD
When the figure is in the RED region PULL DOWNWARD
                 with 10s-Carry in the DOWN REGION

Body Sizes  ( W7 / W8 * D * H )  =   2_1/2 / 3"  * 5_1/2" * 5/16"
(=  65 / 75 mm * 140 mm * 8 mm  )

Have a Look at the HISTORY

impressum:
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© C.HAMANN       http://public.BHT-Berlin.de/hamann        09/08/08