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A disadvantage of this cam'ron system is cam'ron that large batteries, a high voltage power supply, and a very powerful capacitor bank (known as the X-Unit, the system weighed 400 lb) was needed to explode all 32 detonators simultaneously. A cascade of spark gap switches was used to trigger the capacitor cam'ron bank. The whole explosive assembly was held together by a shell made of a strong aluminum alloy called dural (or duraluminum). A number of other shell designs had been tried and discarded. This shell design, designated model 1561, was made of an equatorial band bolted together from 5 segments of machined dural castings, with domed caps bolted to the top and bottom to make a complete sphere. The final bomb design allowed "trap door" assembly. The entire bomb could be assembled ahead of time, except for the pit/initiator. To complete the bomb, one of the domed caps was removed, along with one of the explosive lenses.
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