In 1654, Otto von Guericke invented the main vacuum pump[20] and done his popular Magdeburg hemispheres experiment, displaying that, owing to atmospheric pressure exterior the hemispheres, groups of horses could not different two hemispheres from which the air had been partly evacuated. Robert Boyle improved Guericke's design and style and http://charlievabcc.ivasdesign.com/18774171/not-known-facts-about-arvada-vacuums