spark' arrest"er

1. a device, consisting of wire netting or other material, used to stop or deflect sparks thrown from an open fireplace, a smokestack, or the like.
2. Elect.a device to reduce sparking at contacts where a circuit is opened and closed.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

sparkspark chamber
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