Today was a big deal for the two students I am working with who are making their own telescope and mirror - they started grinding glass. An 8" diameter glass disk is put on top of a tool made from small bathroom tiles, and water and carborundum grit are added between the two and then they push the glass disk back and forth, gradually hollowing out the piece that will be the mirror. Two pieces of glass and grit? Makes an awful sound... This picture is a bit of a mistake - I under-exposed it by mistake, but then decided that I loved the dark painterly effect
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