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| Japanese Explosive Ordnance – Bombs, Bomb Fuzes, Land Mines,
Grenades, Firing Devices and Sabotage Devices |
| Chapter 1 – Section 1 |
| Japanese Army Bombs |
| Type 1 250-kg. High-Explosive Bomb |
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Over-all length: 75 1/4 inches. |
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Length of body: 45 1/4 inches. |
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Diameter of body: 11 3/4 inches. |
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Thickness of wall: 1/4 inch. |
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Material of wall: Tubular steel. |
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Type of suspension: Horizontal |
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Suspenion lug: Normal Army type. |
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Color and markings: Black over-all. One yellow and one white band (7/8 inch) forward of suspension lug, 1 inch red band on tip of nose. |
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Length of tail: 30 inches. |
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Width of tail: 16 1/2 inches. |
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Width of tail fins: 8 1/4 inches. |
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Dimensions of tail struts: Length 11 inches; width 7/8 inches; thickness 1/16 inch. |
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Material of tail: Steel. |
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Type of filling: Preformed, paper-wrapped, paraffin sealed picric acid blocks. |
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Weight of filling: 227 pounds. |
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Total weight of bomb: 550 pounds. |
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Charge/weight ratio: 43 percent. |
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Construction of body: A cast-steel nosepiece is screwed into a tubular-steel body. The tail cone is welded to the after end of the body. The nose piece has a 3-inch orifice to accommodate the C-3 (a) time fuze. |
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Construction of tail: Four fins are welded to the tail cone and braced by two sets of box-type struts. A fuze adapter is welded at the apex of the tail cone. The tail fuze poc-ket has three threads and then an annular groove. |
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Figure 6 - Type 1 250-kg. High-Explosive Bomb. |
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