SHEILA TERRY / SCIENCE PHOTO LIBRARY SHEILA TERRY / SCIENCE PHOTO LIBRARY
Vacuum experiment. Engraving depicting an experiment on the strength of a vacuum conducted by Otto von Guericke (1602-86). At the top of the apparatus is a sphere, formed by two copper hemispheres placed together with a greased leather seal. After the air inside the hemisphere was evacuated, the sphere was demonstrated to take an enormous load. On releasing a valve on the sphere and admitting air, the sphere would fall apart. This principle was used by Guericke in his famous Magdeburg experiment, where two teams of horses failed to pull apart an evacuated sphere some 3.6 metres in diameter.
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