JF Ptak Science Books LLC Post 513
This is really just another bit of fun--the four objects in the sky weren't unrelated to the scene, not at all, though if you wanted you could certainly create a fantastically rigorous and bizarre story for them; they certainly did define the concept of "nothing" for the Blank & Empty Things thread of this blog. here is no doubt that the image has a very quiet, possibly Dadist origin. In fact, this is one illustration from one of the greatest experimental physics books of the 17th century, coming as it does from Otto von Guericke's Experiemnta nova (ut vocantur) Magdeburgica de vacuo spatio (Amsterdam, 1672). In another minute department, this one is also I guess the greatest book ever written by a Mayor of anywhere (as von Guericke (1602-1886) was mayor of
Magedeburg for 33 years). The image shows the greatest of von Guericke's efforts, and one of the greatest (or most important) experiments in experimental science--the dramatic demonstration of the vacuum, showing here that teams of horses could not pull apart two halves of an evacuated sphere, and of course the efficacy of air pressure operating against it (um, the vacuum). The "floating" bits in the sky were an exploded view of the sphere that was the subject of the experiment.
What was more important though, and what the general reader today might easily miss, was that von Guericke created something that many scientists and philosophers said didn't, and couldn't, exist: the vacuum. In modern times, Copernicus depicted the universe as a vast void; Descartes came in the back door (following the ancient and interesting though incorrect theory of Aristotle*), not liking the idea very much, and claiming that such empty space couldn't exist. Von Guericke provided the proof that the vacuum, that nothing, did exist.
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*Aristotle (384-322 BCE) theorized that as air became thinner objects moving through it would move faster, which is true; he further speculated that if there was no air at all, that if vacuums did exist, then objects would move infinitely fast, which he correctly assumed was not possible, and thus the vacuum could not exist.
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