The light wood surround measures 5½” high

These same qualities suited military use with the aircraft

5x magnification makes it great for quick enlargement of things relatively close by

later adapted as a survey barque - as she is portrayed here

Sundial for Travelling MILITARYCOLLECTABLES The light wood surround measuresThis brass pocket sundial is a completely self contained portable instrument, with a compass for alignment and lid for protection. The gnomon is set for latitudes around 50 degrees North, so will be most accurate in the south of England, northern Europe, Canada and so on. At these latitudes this is a functioning time indicator (in as much as sundials ever were!) diameter 3", height 1". Made from chunky solid brass.