On the Construction of a Silvered Glass Telescope, Fifteen and a Half Inches in Aperture, and its use in Celestial Photography

On the Construction of a Silvered Glass Telescope, Fifteen and a Half Inches in Aperture, and its use in Celestial Photography

👓 G W. b. 1864 Ritchey,Henry Draper
On the Construction of a Silvered Glass Telescope, Fifteen and a Half Inches in Aperture, and its use in Celestial Photography

On the Construction of a Silvered Glass Telescope, Fifteen and a Half Inches in Aperture, and its use in Celestial Photography

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