![File:Air pump with flywheel for rotating and rubbing objects together in vacuo, by Abbe Jean-Antoine Nollet, Paris, c. 1746, shown with Magdeburg hemispheres - Putnam Gallery - Harvard University - DSC07933.jpg - File:Air pump with flywheel for rotating and rubbing objects together in vacuo, by Abbe Jean-Antoine Nollet, Paris, c. 1746, shown with Magdeburg hemispheres - Putnam Gallery - Harvard University - DSC07933.jpg -](https://upload.wikimedia.org/wikipedia/commons/2/2f/Air_pump_with_flywheel_for_rotating_and_rubbing_objects_together_in_vacuo%2C_by_Abbe_Jean-Antoine_Nollet%2C_Paris%2C_c._1746%2C_shown_with_Magdeburg_hemispheres_-_Putnam_Gallery_-_Harvard_University_-_DSC07933.jpg)
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