[math-fun] newton rotating liquid mirror

Adam P.G's blog seems amazinger and amazinger. I don't understand his life census, but it too seems amazing. I noticed some post by him about the spinning liquid parabolic mirror being invented by Isaac Newton. I actually made one of those mirrors once using a phonograph turntable and plastic resin. The mirror was quite decent, although I daresay it was not good enough for a quality telescope. A lot of people may be willing to donate an old phonograph turntable no longer useful to them for music.