Drawing, Interior, "Newton's observatory" [at Woolsthorpe Manor, Lincolnshire?], by [Charles Turnor?] Plan of an upper room and staircase at Woolslthorpe Manor, Lincolnshire [?]. With dimensions of floorspace, windows, door, mantel and closet. Scale 1/2 inch to 1 foot. No identification, inscribed: "Plan of Newton's observatory & staircase leading to it taken Feby 1839". Not signed. February 1839