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| Japanese Explosive Ordnance – Army Ammunition – Navy Ammunition |
| Chapter 5 - Section 1 |
| NAVY PROJECTILES |
| 12-cm (120-mm) (4.7-Inch) Complete Round (Semifixed) |
| Case: |
| Length: 21.63 inches. |
| Diameter of base: 6.38 inches. |
| Material: Brass. |
| Weight (empty): 11.13 pounds. |
| Propellant: 30 DC (type 13 propellant): 11.88 pounds (5.40 kg.). |
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Unperforated cylindrical sticks, approximately 3.0 mm (1/8 inch) by 19.4 inches (long-sticks) or 6.4 inches (short-sticks), amber-colored double-base powder. |
| The propellant sticks are enclosed in a bag of heavy brownish silk. |
| Primer: Mk 1 case percussion primer, Model 4. |
| Weapons in which used: |
| Type 3-year 12-cm/45 gun (low angle). |
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This is a pedestal-mounted deck gun characterized by having three recoil cylinders, all mounted below the tube. An interrupted thread breech block is hinged to swing horizon-tally to the right. This gun has been found both with and without an attached splinter shield. |
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British type 12-cm/40 gun (low angle). |
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This gun is characteriszed by having no recoil cylinders above the tube. An interrupted thread breech block is hinged to swing horizontally to the right. Guns of original British manufacture as well as Japanese-made copies have been found in Japanese island de-fense. |
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The following gun is known to use semi-fixed ammunition strongly resembling that for the two guns listed above, but exact size and description of propellant case is not available. |
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Type 11-year 12-cm/45 gun (low angle). |
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This gun is unique in having two recoil cylinders above the tube and one below. The breech block is the horizontal sliding type. |
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Figure 384 – 12-cm Complete Round (Semifixed). |
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