Had a very interesting time at the Herstmonceux Science Park where there were distortion lenses, refracting mirrors and prisms as well as much else. V interesting - and not just because of the different uses of glass. Bottom left is one of the earliest (huge) refracting telescope mirrors - only a tiny bit of miror silvering left on its face - cast from pyrex at Corning in 1911 and a ton of ground glass removed from its face to create the lens curve. Stephen is planning to make a 6" version. Then on to Glyndebourne with a fabulous picnic.
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