ANTIQUE TECHNICAL INSTRUMENT DEVICE MAGDEBURG HEMISPHERES / DEMOSTRATION OF VACUUM / RARITY

a pair of large hemispheres, with mating rims. They were used to demonstrate the power of atmospheric pressure. When the rims were sealed with grease and the air was pumped out, the sphere contained a vacuum and could not be pulled apart by teams of horses. The Magdeburg hemispheres were designed by a German scientist and mayor of Magdeburg, Otto von Guericke, in 1656 to demonstrate the air pump that he had invented, and the concept of atmospheric pressure.

in very good (used) condition to its age, original, old patina
made of brass
dated before 1900s
used for demostration of vacuum and power of atmospheric pressure
measurements: 23 cm (9“) high; 8 cm (3.15“) in diameter
weight: 800 g

Rare and nice collector‘s instrument for demostration of power of atmospheric pressure.
(N103)