powder train

powder train

[′pau̇d·ər ‚trān]
(engineering)
Train, usually of compressed black powder, used to obtain time action in older fuse types.
Train of explosives laid out for destruction by burning.
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References in periodicals archive ?
When the primer fires, the powder in the ignition chamber is the first part of the powder train to be ignited.
When the primer fires, the small amount of powder in the ignition chamber is the first part of the powder train to be ignited.