This U.S. Army film from 1957 was shown to demolition men, instructing them on the use of electric primers. Dynamite and a variety of other explosives are shown.
This is a story on how the military carry out demolitions. This is a standard operating procedure as seen at mark 0:50. Most of the demolition done by today’s Army is by means of explosives as seen at mark 1:11. A main explosive charge is needed. In order to denote them, a small explosive charge is needed. The smaller charge is the blasting cap. There are 2 types of cap as seen at mark 1:30. At mark 2:04, the electrical priming is seen. It requires more equipment too but it’s used in simultaneous charges. A galvanometer is seen at mark 2:33. Different cap types are seen at mark 3:00. The cap goes off when an electric current comes through the lead wires. The electric priming procedure is seen t mark 3:50. A soldier is seen at mark 3:54 securing and setting a cap. At mark 4:57, he tests the cap with a galvanometer. The final component is he blasting machine see n at mark 5:53. A priming adaptor is used to seal the cps at mark 6:17 before placement in the well. Some explosives have no cap well at all as seen at mark 7:06. This is punched manually into the plastic itself. Also with military dynamite, you have to punch your own cap well as seen at mark 7:50. This is a way to prime dynamite. A side punch is seen at mark 8:18.
An example of priming sheet explosive is also seen at mark 8:32. You can also prime sheet explosives without cutting a slot by overlapping 2 sheets and placing the cap between them as seen at mark 9:18. Special charges such as bangelo torpedo are used for special situations but the priming techniques are usually the same as seen at mark 9:35. The same thing applies to the shaped charge as seen at mark 9:48. Cratering charges are primed at mark 10:20. It is used underground. The detonating cord is seen at mark 10:30. At mark 11:15, all the charges are connected to a ring main. The arrangement is seen at mark 12:25. The circular pattern is seen at mark 13:10, also the linear pattern at mark 13:20. This is then connected to a power source. At mark 13:40, the NCO is the one in-charge of the demolition; he checks the circuit with his galvanometer. At mark 14:20, there is no meter reading; he checks the entire cap for no reading. At mark 15:12, he is seen using his hand and a stick for an underground checking of the cap. He protects the splice by tapping with a black tape as seen at mark 16:08. He also uses the western union big tail as seen at mark 16:30. Don’t ever exceed the rating capacity of the blasting machine. Never attempt to fire more than ten caps with a ten cap machine as seen at mark 17:00. The fifty cap machine is seen at mark 17:04. When using the ten cap machine you have to be careful as seen at mark 17:13.
At mark 17:30, they are prepared for blasting. Before the last step, it is advisable to first check the area in all directions and yell fire in the hole 3 times as seen at mark 17:40. The handle is then inserted into the blasting machine. At mark 17:54, the demolition is done. At mark 18:17, the circuits are rechecked for faults and the blasting machine is also changed. The entire length of the firing wire is inspected at mark 19:18 for any connection fault. The fault is located at mark 19:40. Disconnect the firing wire and make the reading. The entire system is also rechecked splice by splice as seen at mark 20:40. The blasting is also done again. For the underground priming, the firing was done at mark 22:00. Skillful demolitions have been done in the army and remember that these skills depend on the man.
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This film is part of the Periscope Film LLC archive, one of the largest historic military, transportation, and aviation stock footage collections in the USA. Entirely film backed, this material is available for licensing in 24p HD and 2k. For more information visit www.PeriscopeFi...
27 авг 2024
