Aquaculture Engineering (2+1)

Chaining - Instruments used for chaining - Chain

Unit 1- Surveying

Chain:
Chains are formed at straight links of galvanized mild steel wire bent into rings at the ends and joined each other by three small circular or oval wire rings. These rings offer flexibility to the chain. The ends of the chain are provided with brass handle at each end with swivel joint, so that the chain can be turned without twisting. The length of a link is the distance between the centers of two consecutive middle rings, while the length of the chain is measured from the outside of one handle to the outside of the other handle.

Following are the various types of chain

• Metric chain
• Surveyor’s or Gunter’s chain
• Engineer’s chain
• Revenue chain
• Steel band or Band chain