UofI_photoelectric_photometer_1913_mount_on_refractor.jpg
Description UofI photoelectric photometer 1913 mount on refractor.jpg | photoelectric photometer mount on refractor, 1913, University of Illinois Observatory | ||||
Date | |||||
Source | National Park Service | ||||
Author | Dr. John Dickel | ||||
Permission
( Reusing this file ) |
|