Artificial roof horizon mercury jar lid

Threaded funnel-shaped lid for the artificial roof horizon mercury jar.

ID:	ACO1262.5
Type:	Artificial roof horizon mercury jar lid
Display location:	Not on display
Credit:	National Maritime Museum, Greenwich, London, Admiralty Compass Observatory
Parts:	Roof artificial horizon (Artificial Mercurial Horizon) Artificial roof horizon box (ACO1262.1) Artificial roof horizon tray (ACO1262.2) Artificial roof horizon hood (ACO1262.3) Artificial roof horizon mercury jar (ACO1262.4) Artificial roof horizon mercury jar lid (ACO1262.5) Artificial roof horizon box key (ACO1262.6)