 | This article relies largely or entirely on a single source. (December 2017) |
| 4.7"/50 caliber Mark 3 Armstong Gun | |
|---|---|
 4.7"/50 Mark 3 guns from Almirante Barroso used in Brazilian fortifications. | |
| Type |
|
| Place of origin | United Kingdom |
| Service history | |
| In service | 1895–1924 |
| Used by |  United States Navy |
| Wars | Spanish–American War |
| Production history | |
| Designer | Elswick Ordnance |
| Designed | 1885 |
| Manufacturer | Elswick Ordnance |
| No. built | 8 |
| Variants | Mark 3 |
| Specifications | |
| Mass | 4,200 lb (1,900 kg) |
| Length | 236.2 in (6.00 m) |
| Barrel length | 231.1 in (5.87 m) bore (48.9 calibers) |
| Shell | 45 lb (20 kg) |
| Caliber | 4.724 inches (120 mm) |
| Elevation | −3° to +20° |
| Rate of fire | 5–6 rounds per minute |
| Muzzle velocity | 2,215 ft/s (675 m/s) |
| Maximum firing range | 9,900-yard (9,053 m) at 20° elevation |
The 4.7"/50 caliber Armstong gun (spoken "four-point-seven-inch-fifty-caliber") were used in the secondary batteries of the United States Navy's protected cruisers New Orleans and Albany during the Spanish–American War.[1]