Type of glass bottle used as scientific and magic apparatus
A Bologna bottle, also known as a Bologna phial or philosophical vial,[1] is a glass bottle which has great external strength, often used in physics demonstrations and magic tricks. The exterior is generally strong enough that one could pound a nail into a block of wood using the bottle as a hammer; however, even a small scratch on the interior would cause it to crumble.[2]
It is created by heating a glass bottle and then rapidly cooling the outside whilst slowly cooling the inside.[3] This causes external compression and internal tension such that even a scratch on the inside is sufficient to shatter the bottle.
The effect is utilized in several magic effects, including the "Devil's Flask".[4]
^Cooley, Arnold James (1854). A cyclopaedia of six thousand practical receipts, and collateral information in the arts manufactures, and trades including medicine, pharmacy, and domestic economy: Designed as a compendious book of reference for the manufacturer, tradesman, amateur, and heads of families. D. Appleton & Co. pp. 124. making Bologna Vials.
^Knight, Edward Henry (1876). Knight's American mechanical dictionary: A description of tools, instruments, machines, processes, and engineering; history of inventions; general technological vocabulary; and digest of mechanical appliances in science and the arts. Hurd and Houghton. p. 110.
^ Eggert, Gerhard (2007). "Hot Glass, Cold Water: Experiments in the History of Glass Fracture". Interim Meeting of the ICOM-CC Working Group: 8–13.
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