30-pounder short gun

The 30-pounder short gun was a piece of artillery mounted on French warships of the Age of sail. They were the middle-sized component of the unified system standardised on the 30-pounder calibre, replacing both the 24-pounders and 12-pounders in many usages.
Usage
The 30-pounder short gun was installed on the lower deck on frigates and on the middle deck of three-deckers, the main battery being armed with 30-pounder long guns and the upper deck, with 30-pounder carronades.
History
In the wake of the Napoleonic Wars, the Navy undertook a number of reforms, most notably a reform in the artillery system. In contrast with the 1788 system, where large warships armed their main batteries with large 36-pounder long guns and upper deck with smaller long guns using smaller shots, it was decided to standardise on the 30-pound calibre, and deploy a variety of guns of different weights, as not to overload the tops. The differences in weight were obtained...