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Demainbray's model of a camera obscura

1752

Demainbray's optical model

1752

Demainbray's optical model

1752

Musical drum, after 1837

after 1837
Model demonstrating distortion of image in an old eye

Model demonstrating distortion of image in an old eye

1752
Double Barometer and thermometer

Double' barometer and thermometer, c. 1740.

1730-1760
Artificial glass horizon in circular fitted wooden case with lid, made by unknown German maker (possibly G.F. Brander, Augsburg?), 1785-1795. Consisting of a circular lacquered brass container with three levelling feet, which holds spirit, covered by a transparent glass plate. When in use, the vessel is filled with spirit leaving an air-gap under the glass to act as a bubble level, which is centred with levelling screws.

Artificial glass horizon.

1785-1795
Spinning wheel Italian, late 17th century.

Spinning wheel Italian, late 17th century.

1651-1700
Triangular glass demonstration prism with fruitwood end-piece and finial handle, unsigned, European, 1700-1799. Glass showing typical imperfections of the period.

Triangular glass demonstration prism with fruitwood end-piece and finial handle

1700-1799