|Diagram of the Magdeburg hemispheres showing an internal vacuum about which the massive weight of the surrounding atoms and molecules of the atmosphere press inward on the spheres.|
In this vacuumed-out state, the pressure of the weight of surrounding atmosphere, piled upwards of 62-miles above the sphere, as is the case for all bodies on the surface of the earth, to the Karman line earth-space boundary where point weightlessness begins, acts to hold the spheres together tightly with great force by pressing inward on the outer casing.
“Could empty space exist, and is heavenly space unbounded?”
|Left: a Schott diagram depiction of German engineer Otto Guericke's circa 1648 attempt to make a vacuum inside of tightly-sealed beer keg, which introduced him to the so-called "sealing problem", i.e. how to seal in the vacuum.  The two men seem to be pulling on the the world's first piston and cylinder prototype, something Guericke would later make, a precipitate of his vacuum research. Right: a Schott diagram depiction of Guericke's solution to the sealing problem: two fitted copper spheres sealed with grease around the rim, spheres which would latter become famously known as the Magdeburg hemispheres. |
“I have no reservations to say frankly and courageously that I have never seen, heard, read or comprehended anything more wonderful than this.”
The original Magdeburg hemispheres (left) and Guericke's vacuum pump (right), in Deutsches Museum, Munich, Germany, at the top of which is shown vacuum bulb, which could be disconnected and carried about as a sort of power or storage vessel a sort of proto type battery.
Close-up view of the hemispheres (left) showing the connectors and stopper valve, which would release the vacuum when desired.
An advertisement (below) depicting entitled "Curious Experiences in Physics: The Magdeburg Hemispheres".
|Depiction of a 24-horse version of the Magdeburg hemispheres from the 1899 book Album of Science: Famous Scientist Discoveries. |
An 8-horse 1662 Magdeburg hemispheres experiment.
A 1994 Magdeburg hemispheres re-enactment.
Parts to the hemispheres and the vacuum pump.
A Magdeburg hemisphere statue
|Magdeburg hemispheres shown partially evacuated (left) and in balance with the atmosphere with no vacuum (right). |