Refracting telescope at the observatory of Hamilton mountain in California - Vintage Nostalgia
Refracting telescope at the observatory of Hamilton mountain in California

Achievement in technology: refracting telescope (lenses rather then mirrors) at the observatory of Hamilton mountain in California since 1888, the world’s first permanently occupied mountain-top observatory

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Reflecting telescope (mirror),  a.D. 1888. - Vintage Nostalgia
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