An image showing 'Artificial Horizon - Box'

An image showing 'Artificial Horizon - Overall'

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Roof artificial horizon

A rectangular cast-iron trough with a pouring hole at one corner, and a black-painted brass-framed roof-shaped cover. Two sides of the cover have clear glass panels at an angle of 90 degrees. Accompanying the instrument is a polished steel mercury bottle with a threaded funnel-shaped cover and a threaded stopper. It is used for storing the mercury when the instrument is not in use.

The artificial horizon is contained in a fitted rectangular mahogany carrying box with a brass plate for securing the mercury bottle.

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Object details

ID:	ACO1262
Collection:	Astronomical and navigational instruments
Type:	Artificial Mercurial Horizon
Display location:	Not on display
Creator:	Crawford, Tyson
Date made:	ca.1900
Credit:	National Maritime Museum, Greenwich, London, Admiralty Compass Observatory
Parts:	Roof artificial 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)