🔭 Theodor Jacobsen Observatory

The Theodor Jacobsen Observatory (TJO) is the on-campus observatory of the University of Washington. Built in 1895, it is the second oldest building on campus and was constructed using the remaining Tenino sandstone blocks from Denny Hall, the oldest and first building on campus. The refracting telescope, enclosed within the dome, has a six-inch Brashear objective lens of a Warner & Swasey equatorial mount. The observatory also includes a transit room on the west side, and a 45-seat classroom that was built as an addition in 1912, on the south side.