Digital Commonwealth — Boston Public Library
The original 200" disc at the observatory, Corning, N. Y.
[ca. 1930–1945]
The original 200-inch telescope disc weighs twenty tons, and is the largest piece of glass in the world. It is on exhibition daily, free to the people at the Observatory Museum, which was dedicated September 2, 1939. On March 25, 1934, the disc was poured at Corning Glass Works.
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