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60-ft Solar Tower Telescope

60-ft Solar Tower
Constructed in 1908, George Ellery Hale used this telescope to identify magnetic fields in sunspots, the first time that a magnetic field had been shown to exist outside of the Earth. His discovery used an effect previously identified in the laboratory, the Zeeman effect, that causes spectral lines into multiple components.

Working in the field of solar seismology, a field created at Mount Wilson, astronomers at USC use the 60-foot solar tower to study wave-like motions of the Sun's visible surface, which in turn convey information about the hidden solar interior. This project is operated by USC as part of the High Degree Helioseismology Network.

Behind the 60-foot Tower is the oldest telescope on the mountain, the Snow solar telescope.