| 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] |
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.