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Magdeburg C


Die Magdeburger Halbkugeln untrennbar verbunden
Bürgermeister von Guericke hat sie erfunden
The Magdeburg Hemispheres inseparably bound
Von Guericke, the Mayor, invented them

Die Gültigkeit erlischt 3 Monate nach Bekanntmachung, Magdeburg 1921

Otto I. erbaut Magdeburg

gedruckt von K.T.

A, B, C, D
History | Science    

The Magdeburg Hemishperes: In 1654 and again in 1657, Otto von Guericke demonstrated the effects of air pressure, thereby prooving the existance of the earth's atmosphere. source

The Magdeburg hemispheres were a pair of large copper hemispheres precisely cast so that their rims fit tightly together. When the rims were sealed with grease and the air was pumped out, the resulting sphere contained the world's first artificial vacuum. The Magdeburg hemispheres were designed by German scientist Otto von Guericke in 1650 to disprove Aristotle's famous supposition that 'Nature abhors a vacuum'. To get the air out of the sphere, von Guericke also designed the world's first vacuum pump, which consisted of a piston and cylinder with one-way flap valves. To power the machine, several people would turn a crank arm connected to the vacuum pump. The pressure exerted on the spheres was so great that 16 horses were unable to pull the two halves apart.

Guericke's original hemispheres are on display in the Deutsches Museum in Munich.

Magdeburg A Magdeburg B Magdeburg C Magdeburg D


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