3 ms·
John Dobson used this technique to great effect to grind his own parabolic mirrors to build reflector telescopes. If you're not familiar, I highly recommend rea
by Treebeard123 4y ago
John Dobson used this technique to great effect to grind his own parabolic mirrors to build reflector telescopes. If you're not familiar, I highly recommend reading about his "Dobsonian" telescope design and its impact on amateur astronomy.
- anadem 4y agoYes, the grinding process is surprisingly easy. My son and I met John when he was showing one of his telescopes in San Francisco one evening in the '80s, and he gave us one of his instruction leaflets and an eight inch glass from a porthole, which we ground into a mirror for our own Dobsonian telescope. He was a generous and kind, humble man; at that time he was living in an ashram in SF.