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From: Geertje Hek
Website:
http://staff.science.uva.nl/~ghek/pictures.html
Hek writes: "Nice and unexpected example of buckling in an axially loaded cylinder. The load had probably been applied accidentally to this roll of toilet paper ... There is a mathematical explanation for this buckling phenomenon."
See the "Cylinder Buckling" website by Professor Gabriel Lord, Department of Mathematics, Heriot-Watt University, Edinburgh, UK:
http://www.ma.hw.ac.uk/~gabriel/cylinder.html
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