Artificial roof horizon tray disc

Ivory disc from the artificial roof horizon tray.

ID:	NAV0005.6
Type:	Artificial roof horizon tray disc
Display location:	Not on display
Credit:	National Maritime Museum, Greenwich, London, Adams Collection
Measurements:	Diameter: 21 mm;Overall: 3 mm
Parts:	Roof artificial horizon (Artificial Mercurial Horizon) Artificial roof horizon box (NAV0005.1) Artificial roof horizon tray (NAV0005.2) Artificial roof horizon hood (NAV0005.3) Artificial roof horizon mercury jar (NAV0005.4) Artificial roof horizon mercury jar lid (NAV0005.5) Artificial roof horizon tray disc (NAV0005.6) Artificial roof horizon box part (NAV0005.7)