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Papin’s digester |
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Papin’s digester |
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Parabolic Reflector of Heat |
 ,  |
Paraboloid concave reflector |
 ,  |
Part of double thermoscope after Looser |
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Part of Melloni's bench |
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Part of solar microscope |
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Part of solar microscope |
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Parts of a Wimshurst machine |
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Parts of Pascal’s vane apparatus |
