Koehler depressing gun carriage, late 18th century

Wooden instructional model, early 19th century.

The Koehler Depressing Carriage was a type of gun carriage invented in 1782 by Lieutenant George Frederick Koehler of the Royal Artillery. It was devised to enable guns to be fired at a steeply downward-facing angle. It was made necessary by the peculiar circumstances that the British Army faced during the Great Siege of Gibraltar between 1779-1783.

This finely executed model was possibly used for instructional purposes at the Royal Military Academy, Woolwich where Artillery officers were trained.