Artificial horizon, mercury roof type, a rectangular wooden trough, a brass-framed roof-shaped folding cover with two clear glass panels at 90°, and with a circular wooden jar with threaded stopper and funnel, no box, by an unknown probably English maker, about 1850

Artificial horizon, mercury roof horizon, ordnance pattern, of black-painted brass and iron with mercury tray and bottle, in fitted wooden box, signed and made by Patrick Adie of London, c. 1860

Artificial horizon, mercury roof horizon, rectangular black-lacquered cast iron trough with pouring hole and brass-framed roof-shaped cover, iron bottle and iron funnel, in fitted wooden carrying box, signed and made by Troughton and Simms of London, c. 1860

Artificial horizon, mercury roof horizon, black-lacquered cast iron trough, brass-framed roof-shaped cover, iron bottle and funnel for mercury, in fitted wooden carrying box, signed and made by Negretti and Zambra of London, c. 1860

Artificial horizon, mercury roof horizon, rectangular black-lacquered cast iron trough with pouring hole and brass-framed roof-shaped cover with clear glass panels, round iron bottle (full?) with stopper and iron funnel, in fitted wooden carrying box, signed and made by Elliott Brothers of London, c. 1860

Artificial horizon, mercury roof horizon, rectangular black-lacquered cast iron trough with pouring hole and brass-framed roof-shaped cover with clear glass panels,round iron bottle (full?) with stopper and iron funnel, in fitted wooden carrying case, signed and made by Elliot Brothers of London, c. 1860

Artificial horizon, mercury roof type, a rectangular wooden trough, a brass-framed roof-shaped folding cover with two clear glass panels at 90°, and with a circular wooden jar with threaded stopper and funnel, no box, by an unknown probably English maker, about 1850

Artificial horizon, mercury roof type, a rectangular wooden trough, a brass-framed roof-shaped folding cover with two clear glass panels at 90°, and with a circular wooden jar with threaded stopper and funnel, no box, by an unknown probably English maker, about 1850