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23A Optical Instrument Known As Gregorian Newtonian Or Casserain (10,9). ?e?l.c?i?g Telescope Thanks In Advance For Your Help"ŷ

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patparker6 | 15:25 Sun 24th Jan 2016 | Crosswords
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Optical instrument known as gregorian Newtonian or casserain (10,9) ? Telescope . Thanks in advance for your help
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Reflecting telescope
telescope
Should have read the question properly.
At least you tried, bhg. ;-)
Reflection telescope
Oops- reflecting

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23A Optical Instrument Known As Gregorian Newtonian Or Casserain (10,9). ?e?l.c?i?g Telescope Thanks In Advance For Your Help"ŷ

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