18-pounder long gun

18-pounder long gun
Firing of an 18-pounder. Engraving by Louis-Philippe Crépin.
Type	naval gun
Place of origin	France
Service history
Used by	France, Spain, Great Britain, Netherlands, Sweden, United States
Specifications
Mass	2,060 kg 365 kg (mount)
Barrel length	2.572 metres (18.544 calibres)
Shell weight	8.8 kg
Calibre	138.7 mm[1]

The 18-pounder long gun was an intermediary calibre piece of naval artillery mounted on warships of the Age of Sail. They were used as main guns on the most typical frigates of the early 19th century, on the second deck of third-rate ships of the line, and even on the third deck of late first-rate ships of the line.