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| ITALIAN AND FRENCH EXPLOSIVE ORDNANCE |
| Chapter 7 |
| ITALIAN IGNITERS |
| Friction Delay Igniters - Micca Da 40 and 60 |
| Data |
| Micca da 40 | Micca da 60 | |
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Length |
3.7 in. | 4.5 in. |
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Diameter |
0.25 in. | 0.25 in. |
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Delay |
10 sec. | 15 sec. |
| Description |
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This prepared detonator consists essentially of a short lenght of safety fuse accommo-dated in an aluminum tube between a detonator and a friction igniter. This latter is initia-ted by a sharp pull on a galvanized iron wire. |
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Resistance to the pull is provided by a flange on the aluminum tube. The assembly may be prepared for delays of 10 to 15 seconds, and the aluminum tube is then 93 or 113 millimeters respectively in length. The exterior of the tube surrounding the detonator it-self is painted red, but the remainder of the assembly is left unpainted. |
| Operation |
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The galvanized wire is pulled, igniting the friction mix and starting the safety fuse burn-ing. After 10 to 15 seconds delay the safety fuses burn to the end and ignite the deto-nator. |
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Figure 247 |
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