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Making a Busack-Riccardi-Honders Astrograph
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01-12-2016, 09:20 PM
Wavytone
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Join Date: Jul 2008
Location: Killara, Sydney
Posts: 4,147
Clive if you liked that on an intellectual level, try this
https://www.google.com/patents/US3926505
Esp. Figure 3. Now if Stefan can make a 150mm BRH, maybe one of these could be the next challenge.
Or a Baker-Nunn...
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