Bolognese bottle
A Bolognese bottle , also known as a Bolognese hammer or a spring flask , is a thick-walled, spherical glass vessel with a long neck that is robust on the outside and vulnerable on the inside thanks to a special manufacturing process.
history
When making vessels from glass , it is necessary to slowly cool the glowing mass in order to avoid internal tension. Since the 18th century, however, a bottle shape has been produced in Bologna , which is put into a state of tension by intentionally cooling it down quickly. This bottle can be used like a hammer to drive a nail into a board. On the other hand, if you drop a nail through the neck of the bottle, the bottle implodes . The effect is often demonstrated as a magic trick or in experimental presentations.
See also
- Single-pane safety glass , which shatters into numerous small parts with mostly obtuse angles when damaged, works on the same principle. Here the preload is generated by a heat treatment.
- Bolognese tears are teardrop-shaped glasses that drain into a thin end. If you break the end piece, the whole body implodes into tiny pieces.
Web links
- Montana State University "Bologna bottle".
Individual evidence
- ↑ According to Meyer's Konversationslexikon from 1905 (accessed on October 4, 2015), the Bolognese bottle was invented by Asmadei in 1716.