Gunners perpendicular (level) – Berge, London.

Gunners perpendicular (level) – Berge, London.





Mathew Berge

Country of manufacture

UK and Ireland

Categories: Scientific, Calculating, Engineering antiques


Rare brass gunners perpendicular with steel tips and sliding steel pointer signed, ‘Berge, London’, measuring 4.5″ high and 3.5″ wide with a 2.75″ bubble level.

A perpendicular sometimes called a level enabled a gunner to establish the center line of an artillery piece and thus its direction of fire. The instrument was placed transversely on the gun’s barrel and, once levelled using the spirit level, the steel-tipped slide was depressed. Marks were made at the muzzle and breech of the gun and joined by a chalk line. Perpendiculars incorporating spirit levels were first purchased by the British Board of Ordnance in 1757 and replaced earlier versions in which the leveling was carried out with a plumb bob and line.

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