Difference between revisions of "Ballast"
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== Description == | == Description == | ||
| − | 1) A heavy material used to provide weight and/or stability. Ballast is commonly used in hot-air balloons, ships, and submarines. Examples of materials used for ballast include [ | + | 1) A heavy material used to provide weight and/or stability. Ballast is commonly used in hot-air balloons, ships, and submarines. Examples of materials used for ballast include [[water]], [[sand]], and [[iron]]. |
| − | 2) Crushed [ | + | 2) Crushed [[concrete]], [[slag]], or [[stone]] used as a foundation for railroad beds. |
== Authority == | == Authority == | ||
Revision as of 10:15, 8 January 2014
Description
1) A heavy material used to provide weight and/or stability. Ballast is commonly used in hot-air balloons, ships, and submarines. Examples of materials used for ballast include Water, Sand, and Iron.
2) Crushed Concrete, Slag, or Stone used as a foundation for railroad beds.
Authority
- Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997
- The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998
- Encyclopedia Britannica, http://www.britannica.com Comment: "Railroad." Encyclopædia Britannica. 3 Sept. 2004 .
- Art and Architecture Thesaurus Online, http://www.getty.edu/research/tools/vocabulary/aat/, J. Paul Getty Trust, Los Angeles, 2000