This guide provides historical, digital, and archival resources on the pouring of the 200" disk which was used in the Hale Telescope at Palomar Mountain in California. When the disk was cast, it was the largest single piece of glass ever made.
The mirror was made using Corning Glass Works' signature Pyrex®, a special glass designed to resist heat expansion. After many years of trial and error experimentation, as well as the advent of World War II, the disk was finally installed in 1948 in the Palomar Observatory.
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