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Bilby tower
A tower used in triangulation and consisting of two braced tripods, one within the other, constructed, according to the design of J. S. Bilby, so that an observer on a platform at the top of the outer tripod can move about without disturbing an instrument mounted on the top of the inner tripod. The Bilby tower was put into use in 1927 and is standard equipment in triangulation done by the U. S. National Geodetic Survey. The tower can easily be put up, taken down, and moved to a new location. It is also durable. Because the original Bilby tower and most subsequent ones of that design have been built of steel, the tower is often referred to as the Bilby steel tower.
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- Part of Speech: noun
- Synonym(s):
- Blossary:
- Industry/Domain: Earth science
- Category: Mapping science
- Company: American Congress on Surveying & Mapping
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