The Story of Palomar, 1948

Film about the building of the Hale Telescope. Includes footage of E. Hubble, M. Humason, B. Rule, R. Porter, M. Mason, J. Anderson, M. Brown, L. DuBridge, I. Bowen, and technicians working on the 200-inch mirror.
For more information, see archive.org/details/capsca_0000