First two images are of Leah, the 8" refractor installed in 1883 . The third is Rachel, a 20" refractor installed in 1915. Last is Nellie, the newer 36" reflector. This place is a treasure in the Bay Area. Open nights on Fridays and Saturdays are the best. The volunteers who handle the telescopes are passionate about astronomy and their enthusiasm is contagious. Thanks to them I've peered into the Pleiades and seen Io, Europa and Ganymede and their shadows transit while Jupiter was in opposition. I've also been there when humidity was too high for stargazing, so I just gazed at the telescopes.