|This photograph of the 60-foot solar tower telescope was taken in 1907 just after it became operational. After several years of observations it was upgraded through the addition of a second tower built around this tower which now supports a protective dome. The earliest material in the Mt. Wilson Solar Photographic Archive were taken by the 60-foot tower telescope while it was in this configuration.
A drawing from a paper by Hale (1908) shows the optical configuration at the top of this tower.