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200-Inch Hale Telescope, Mount Wilson

200-Inch Hale Telescope, Mount Wilson Astronomy
Price:
 
$19.95

  

Stock #: 696945
Type: Postcard
Era: Real Photo
Size: 3.5" x 5.5" (9 x 14 cm)
Additional Details:
height of Dome: 135 Ft. Diameter: 137 Ft. Weight: 1,000 tons. Weight of telescope: about 500 tons. The mirror, mounted in the lower end of the telescope, weighed 20 tons before grinding and polishing, 14 1/4 tons after. it is 200 inches in diameter. 24 inches thick at the edge, 20 1/4 inches thick at the center. the upper surface of the mirror is covered by a thin but brilliant coat of aluminum, is concave and focuses the light of a star in the same way as a lens. Mount Wilson and Palmar Observatories Photograph.

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