Astrolabes of Africa
Although it is not signed or dated, we can place the manufacture of this astrolabe in the Maghrib, and date it probably to the 13th century. As well as having the standard latitude projection on the front, with its rete and beautifully-stylised star pointers, the back has a universal projection and so can be used in any latitude. Inv. 41122
volvelle / sundial / diptych-dial / compass-dial
Diptych-dial; ivory; oval; filled in with black and red colour; brass volvelle for interconverting solar and lunar times; vertical dial for string-gnomon surrounding pin-gnomon dial; inscription; horizontal dial for string-gnomon surrounding pin-gnomon scaphe-dial showing Babylonian hours; date and signature; compass well; crowned asp trade-mark and Tucher legend; central engraved gilt plaque.