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Types of chain - Revenue chain & Steel band
Unit 1- Surveying
Chaining: Instruments used for chaining
Types of chain
Types of chain
Revenue chain
The Revenue chain is 33 ft long and consists of 16 links, each link being 2 1/16 ft long. This chain is mainly used for measuring fields in cadastral survey.
Steel band or Band chain
Steel band or Band chain consists of a long narrow strip of blue steel of uniform width of 12 to 16 mm and thickness of 0.3 to 0.6mm. Metric steel bands are available in length of 20 or 30 m.
During continuous use the length of a chain gets altered. Its length is shortened chiefly due to the bending of the links. Its length is elongated either due to stretching of the links and joints opening out of the small rings or due to the wear of wearing surface. For accurate work it is necessary to test the length of the chain from time to time and make adjustments in the length.
The Revenue chain is 33 ft long and consists of 16 links, each link being 2 1/16 ft long. This chain is mainly used for measuring fields in cadastral survey.
Steel band or Band chain
Steel band or Band chain consists of a long narrow strip of blue steel of uniform width of 12 to 16 mm and thickness of 0.3 to 0.6mm. Metric steel bands are available in length of 20 or 30 m.
During continuous use the length of a chain gets altered. Its length is shortened chiefly due to the bending of the links. Its length is elongated either due to stretching of the links and joints opening out of the small rings or due to the wear of wearing surface. For accurate work it is necessary to test the length of the chain from time to time and make adjustments in the length.
Last modified: Thursday, 21 April 2011, 9:21 AM