Lick Observatory 36-inch refractor

Here is a photo that took in 1990 of the Lick Observatory 36-inch refractor (91 cm). The observatory is located on Mt. Hamilton to the east of San Jose, California. The lens was made by Alvan Clark & Sons of Cambridge, Massachusettes and Warner & Swasey of Cleveland, Ohio built the tube, mount and pier. It saw first light in 1888. The focal length of the objective is 674-inches (17,119.6mm) which makes it an F/18.72 system.