The rolled sail formed a 6 to 7-in.-diameter cylinder. A pure guess of the amplitude of vibration put it at 10 to 12 in., side to side, for a total movement of about 20 to 24 in.

NEWBURYPORT — The Custom House Maritime Museum’s newest edition, a 19th century painting by James E. Butterworth titled “The Clipper Ship Staghound With Partially Furled Sails,” was ...