120-pounder Whitworth naval gun

The 120-pounder Whitworth naval gun was designed by Joseph Whitworth during the 1860s. It was a rifled muzzle loader and used his hexagonal rifled bore design, the principle of which is described in the article on the 70-pounder Whitworth naval gun.

120-pounder Whitworth gun
Type	Naval gun
Place of origin	United Kingdom
Service history
In service	1865–
Used by	Brazil
Wars	Paraguayan War
Production history
Designer	Joseph Whitworth
Manufacturer	Joseph Whitworth
Produced	1865?–
Specifications
Mass	16,660 pounds (7,556.8 kg)
Length	144 inches (3.658 m)
Shell	Solid shot Explosive shell
Shell weight	151 pounds (68.5 kg)
Calibre	7-inch (178 mm)
Maximum firing range	about 5,540 yards (5,070 m)
Filling	Black powder
Filling weight	5 pounds (2.3 kg)[1]

Service

A number of 120-pounders were bought by the Imperial Brazilian Navy and used to arm some of its ironclads during the Paraguayan War in the late 1860s.^[2]