OB-SCERTAINER

EDUCATIONAL KITS, SAID SPECIMEN KITS COMPRISING ROUND OR DISC LIKE BOXES HAVING TWO PARTS, A COVER AND A LOWER BODY PART, THE LOWER PARTS EACH HAVING DIFFERENT INTERIOR CONFIGURATIONS CAPABLE OF DETERMINING, WHEN THE ASSEMBLY IS MANIPULATED BY HAND, THE GEOMETRIC PATH THAT A SMALL BALL MUST FOLLOW IN RESPECT TO THE INTERIOR CONFIGURATION OF THE SPECIFIC ITEM TESTED, USED IN SCHOOL CALSSROOMS TO DEVELOP POWERS OF OBSERVATION