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TO PROVIDE A SIMPLE 'SEE-SAW' FOR EXPERIMENTS ON BALANCING MASSES ,LEADING TO THE PRINCIPLE OF THE LEVER. COMPRISES FIVE WOOD BEAMS APPROXIMATELY 610 X 44 MM GRADUATED AT 38 MM INTERVALS, FOUR
U-SHAPED SUPPORTS , GROOVED TO LOCATE FULCRUM PINS , 40 BRASS PENNY-WEIGHTS 25 X 25 X 2 MM AND 20 FULCRUM PINS. |
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