3-inch brass refractor
is first telescope, bought at age 11, was this Broadhurst Clarkson 3-inch refractor on a pillar-and-claw mount. His first paper
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is first telescope, bought at age 11, was this Broadhurst Clarkson 3-inch refractor on a pillar-and-claw mount. His first paper
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The Hubble Space Telescope and James Webb Space Telescope: The History of the World’s Most Important Telescopes
byCharles River Editors