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$Giuseppe Piazzi's refracting telescope with achromatic lens built by Jesse Ramsden$

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Giuseppe Piazzi's refracting telescope with achrom...

$A 23-inch refractor built by Alvan Clark$

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$A 23-inch refractor built by Alvan Clark$

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$The testing of glass for the 26-inch refractor built by Alvan Clark$

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$Long focal length refracting telescope$

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