The Pacific War Online Encyclopedia: Japanese 4.7"/45
Dual-Purpose Gun ([original](http://pwencycl.kgbudge.com/J/a/Japanese%5F4p7%5F45%5Fdual%5Fpurpose%5Fgun.htm)) ([raw](?raw))| 
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Japanese 4.7"/45 10th Year Type (1921) Dual-Purpose Gun
National Archives #80-G-247827. Via NavWeaps.com
| Bore diameter | 4.724" 120mm |
|---|---|
| Ammunition type | Fixed base or nose fused HE shells. Incendiary, shrapnel, illuminating, and antisubmarine rounds were also available. |
| Weight of round | 45 lbs 20.41 kg |
| Velocity | 2720 feet per second 830 meters per second |
| Maximum elevation | 75 degrees |
| Range | 17,500 yards 16,000 meters |
| Altitude | 32,800 feet 10,000 meters |
| Firing cycle | 6 seconds |
This weapon was used on Akagi and the Furutakas as well as someescort vessels. Relatively few were produced, and the gun suffered from an inappropriate choice of powder grain, leading to unburned grains at the muzzle, which reduced accuracy. The propellant problem was resolved late in the war.
A number were used for coastal defense, as shown in the photograph above.
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