In Dirty Dozen movie what were silver ben like items Bronson collected from each member and put in a bag before the dozen captured Colonel Everett HQ Staff at war games?

Answer 1

Those devices were late-model aluminum-bodied revisions of the original #10 Delay Switch that was designed and manufactured by the British, and which would have been in wide use in that area of the European theatre during the latter part of WWII. These were often also called "pencil detonators" or "timing pencils."

The delay mechanism worked through chemical erosion of a metal wire which restrained a striker under spring pressure, and as such was not a very accurate timing device. The chemical agent (copper chloride) was contained in a glass vial inside the body tube, which was very thin. Crushing the tube released the agent which started eroding the wire. When the wire weakened to a point where the spring could break it, the striker hit the percussion cap, causing it to ignite.

The end of the device that looked like a lattice cage was where one embedded the detonator into the explosive. If you slow down the DVD and zoom-in very closely you will notice what looks like a shiny metal wire near that lattice cage; this is the safety strip which blocked the striker from hitting the percussion cap, and was removed before deploying.

These devices were so unreliable that they had to design-in an "inspection hole," which you can also see near the safety strip when you slow down the DVD and zoom-in. You crush the body to start the delay and then you look through the inspection hole. If you can see through it, it's (supposedly) good to go as soon as you remove the metal safety strip; if not, that means the thing already tried to detonate on you, and the only thing preventing it from doing so was that safety strip! If this is the case you were supposed to discard it and then try another one.