https://en.wikipedia.org/wiki/Magdeburg_hemispheres https://en.wikipedia.org/wiki/Magdeburg_hemispheres might be a fun clickhole to figure out what this was ca

https://en.wikipedia.org/wiki/Magdeburg_hemispheres https://en.wikipedia.org/wiki/Magdeburg_hemispheres might be a fun clickhole to figure out what this was called in its time. Like, what was on the posters? the first section of whose book Technica Curiosa, titled Mirabilia Magdeburgica, was dedicated to von Guericke's work. The earliest reference to the celebrated Magdeburg hemispheres experiment is on page 39 of the Technica Curiosa, That title is certainly closer to "Tech Demos".