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| Japanese Explosive Ordnance – Army Ammunition – Navy Ammunition |
| Chapter 4 – Section 1 |
| ARMY PROJECTILES |
| 37-mm High- Explosive Incendiary Projectile |
| Over-all length of projectile: 89 mm (3 1/2 inches) without fuze. |
| Length of complete round: 197 mm (7 3/4 inches) fuzed. |
| Diameter at bourrelet: 37 mm (± tol.). |
| Width of rotating band: 10 mm (25/64 inch). |
| Weight of projectile filled: 436.2 grams. |
| Filling: Cyclonite and incendiary mixture. |
| Weapons in which used: Ho-203 aircraft cannon. |
| Case: |
| Length: 111.5 mm. |
| Diameter at base: 47.0 mm. |
| Weight (empty): 226.5 grams. |
| The case is comparatively short, made of brass, and is slightly necked. |
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Propellant: Graphited smokeless powder in flat 4-mm squares poured loosely into the case and sealed in with a cardboard disc. The weight of the propellant is 59.8 grams. |
| Color and markings: Black body, red nose band, yellow body band. Characters |
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(Ho 203) |
| are stenciled on the body. |
| Fuzing: Type 100 small instantaneous fuze. |
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Remarks: This projectile is constructed in two pieces. It has a nearly straight-sided main body and an ogival-shaped nose piece which threads into the main body. The main charge is cyclonite and an incendiary mixture. The incendiary mixture is pressed into the base of the cavity, with the cyclonite filling the re-mainder of the cavity and the nose piece. |
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There is also and empty practice projectile similar in appearance to the H.E.I. but having the nose piece and dummy fuze constructed in one piece. The projectile is painted black over-all and has |
 (Ho 203) and |
 (Ma 438) |
| stenciled on the body. |
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Figure 222 – 37-mm High-Explosive Incendiary Projectile. |
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