recently as fifty years ago, it lay in its original box, with the cushion and winding key. They have since been lost in the course of using H-4—transferring it from one place to another, exhibiting it, winding it, running it, cleaning it, transferring it again. In 1963, despite the sobering lesson of the lost box, H-4 visited the United States as part of an exhibition at the Naval Observatory in Washington. Harrison’s big sea clocks,
