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The original Mark I guns had trunnions and no liner. The trunnions were later cut off and a liner inserted, converting the weapon to fixed ammunition. At that time, the guns consisted of liner, tube, jacket and nine hoops. The hooping began 3.5 inches (9 cm) from the breech and stopped 59.5 inches (151 cm) from the muzzle. There was no muzzle bell. Used a Dashiell Mark II Mod 2 breech mechanism. |
USS Chicago in early 1890s
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| Designation | 5"/31 (12.7 cm) Mark 1 |
| Ship Class Used On | Chicago |
| Date Of Design | about 1885 |
| Date In Service | 1886 |
| Gun Weight | 6,190 lbs. (2,808 kg) without breech |
| Gun Length oa | N/A |
| Bore Length | about 155 in (3.937 m) |
| Rifling Length | N/A |
| Grooves | N/A |
| Lands | N/A |
| Twist | N/A |
| Chamber Volume | N/A |
| Rate Of Fire | about 6 rounds per minute |
| Type | Bag (later semi-fixed) |
| Projectile Types and Weights | AP - 50 lbs. (22.7 kg) |
| Bursting Charge | N/A |
| Projectile Length | N/A |
| Propellant Charge | 10 lbs (4.5 kg) |
| Muzzle Velocity | 2,300 fps (701 mps) |
| Working Pressure | N/A |
| Approximate Barrel Life | N/A |
| Ammunition stowage per gun | N/A |
| Elevation | With 50 lbs. (22.7 kg) Shell |
| Range @ 30 degrees | 16,000 yards (14,630 m) |
| Designation | Single Mounting with Gravity Return
Chicago (2): Mark 1 |
| Weight | N/A |
| Elevation | N/A |
| Elevation Rate | Manual operation, only |
| Train | about +150 / -150 degrees |
| Train Rate | Manual operation, only |
| Gun recoil | N/A |