Nuremberg ivory diptych with Ducher maker's mark (#1 on p. 117 Gouk, Ivory Sundials of Nuremberg). 1A=wind rose, 32 points numbered from East. 1B=pin-gnomon altitude dial. 2A=string-gnomon dial for latitudes 54, 48, 42 and 2 scaphe dials for 50, 45 showing Italian hours. 2B=exact tables, incorrect as usual for Duchers (see Gouk p.117), and lunar volvelle.
