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The four domes, from the left clockwise, are;
The Calver Dome which houses the Calver Reflector
The Robinson Dome which houses the Grubb 10 inch Refractor
The Troughton Dome which houses the Troughton Equatorial
The 1827 Dome which houses the Grubb 15 inch Reflector

Last Revised: 2010 February 22nd