Excavation for foundation of Hale Solar Laboratory, Pasadena. Three unidentified men stand in the area; one in the pit and two above it, seen on the far right, next to a truck. Within the excavated area are several shaped areas surrounded by deeper channels. A number of large tubes are scattered throughout the construction area. A wooden fence surrounds the excavated pit. Trees are seen in the background. Image courtesy of the Observatories of the Carnegie Institution for Science Collection at the Huntington Library, San Marino, California.
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