The exploratory pole conveys 2 metal plates atdifferent focuses. These metal plates bolster aglass plate and a focal point. One is on the highest point of theother balanced by. 3 springs and screws. Onapplying a heap the bar twists slightly,increasing the separation between the place andthe focal point. Newton's rings are seen before applying the heap. As 'the end is connected step by step the rings keep running into the middle, vanishing each one in turn. Finish with magnifying instrument tube however without weights..

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