Description
Alvan Clark & Sons 4-inch F/15 Refractor Telescope, Cambridgeport, Massachusetts, 19th/early 20th century, the 49-in. brass main tube engraved on ocular collar Alvan Clark & Sons Corpn Cambridgeport Mass, rack-and-pinion focusing, 12-in. finderscope, and dust cap, mounted on a #6 equatorial mount with geared slow motion setting circles marked PAT...