From the Caltech Archives: footage depicting the construction of the Palomar Observatory.
The Universe from Palomar, 1967
This first film, produced two decades after the opening of the observatory, covers the history of the telescope's construction and operation, featuring appearances by Ira Bowen (who also narrates), Edwin Hubble, Milton Humason, and Bruce Rule, plus additional voice-overs by George McCauley and Melvin Johnson.
The above film drew extensively on this archival 16mm footage taken during the construction.
For more on this and other treasures, visit the Caltech Archives.