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The Sinden Optical Company was given the job of restoring the Grubb 15 inch Reflector for the Armagh Observatory, full details can be found here, http://www.arm.ac.uk/history/instruments/Grubb-15inch.html. Malcolm Bannister kindly these pictures showing the restoration process.
David Sinden (on the right) talks about the Grubb telescope to Jack Youdale.
Top of the 15 inch telescope showing the Newtonian Focus.
The Equatorial Mount.
The Cassegrain Focus at the bottom of the tube.
Part of the Brass telescope drive.
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