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| Japanese Explosive Ordnance – Army Ammunition – Navy Ammunition |
| Chapter 4 – Section 3 |
| ARMY MORTARS |
| Type 89 - 50-mm Incendiary Mortar |
| Weight complete round: 1.25 pounds. |
| Weight incendiary mixture: 10.7 ounces. |
| Filling: Incendiary mixture: |
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Potassium nitrate: 47.7 percent. |
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Aluminum: 21.7 percent. |
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Sulphur: 19.9 percent. |
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Antimony trisulphide: 6.1 percent. |
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Wax: 2.8 percent. |
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Propellant: Nitrocellulose powder. |
| Over all length: 6.25 inches. |
| Length propellant containers: 1.25 inches. |
| Diameter propellant container: 1.02 inches. |
| Maximum diameter: 1.97 inches (50 mm). |
| Color: Natural brass body with black propellant container. |
| Fuzing: Powder delay train. |
| Weapon in which used: Type 89 grenade discharger. |
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Description: The shell is a cylindrical sheet-metal tube with a hemispherical nose and is covered with clear lacquer. Around the side of the casing are four silver-foil disks, each disc covering seven ports in the shell casing. The casing is crimped over the base, which contains two black-powder delay trains and is threaded to receive the propellant hous-ing. The propellant housing housing is of steel, with six gas-escape ports in the sides and a percussion cap set in the screwed-in base. The propellant is contained in a copper cup inside the propellant housing. |
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Operation: The flash from the propellant ignites the delay trains in the base of the shell, which in turn ignites the incendiary filling. |
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Remarks: Another incendiary shell, the type 10-year, is similar in appearance and opera-tion to the type 89 shell. It is 5 7/8 inches in length; the color of the body is natural brass; and the propellant assembly is black. There are eight sets of perforations covered with silver-foil disks. The type 10-year shell is fired from the type 10-year grenade dis-charger, an obsolete weapon that as the forerunner of the type 89 grenade discharger. |
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Figure 298 – Type 89 50-mm Incendiary Mortar. |
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