Ballast.

« Back to Dictionary Index

1. A device used with a fluorescent and high intensity lamp, to provide the necessary circuit condition for starting and operation. 2. Any material used as non-structural fill or dead weight. 3. Heavy material, such as water, sand, or iron which has no function in a machine except increase of weight. 4. Crushed rock or gravel which is spread on a roof surface to form its final surface.

No comments yet.

Leave a Reply