The picture

The picture currently at the head of the blog is of James Clerk Maxwell’s zoetrope – which he designed himself as an improvement on the more normal arrangement with slits.  The lenses Mawell used allowed a larger field of view and brighter image.  The strip inside, with rings, was an animation of vortex rings leapfrogging each other – the first example I know of as a moving picture used as a teaching aid.  Circling vortex rings were a popular model of the atom at the time (1860s & 70s).  The zoetrope is in the Museum at the Cavendish Laboratory.  Modern animations of circling vortex rings can be found here
Creative Commons Licence
Photo of Maxwell's zoetrope by Isobel Falconer is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.
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