Ivory diptych sundial for latitude 47 degrees by Hanns...
Ivory diptych sundial for latitude 47 degrees by Hanns Trosc
Ivory diptych sundial for latitude 47 degrees by Hanns Troschel, with vertical and horizontal dial, pin gnomon for Italian & Babylonian hours, lunar volvelle and wind pose. Wind vane, compass needle and cover glass missing. German, c.1628