Types of Surveying Chains
- Metric chains
- Steel band or Band chain
- Gunter’s chain or surveyors chain
- Engineers chain
- Revenue chain
1. Metric Chain:
Metric chains are made in lengths 20m and 30m.
Tallies are fixed at every five-meter length and brass rings are provided at every meter length except where tallies are attached.
2. Steel band or Band chain
Steel bands are preferred than chains as they are more accurate and easy to use. The disadvantages are they get broken down easily, and it’s difficult to service in the field. The length of the tape is 20 and 30m, 12 to 16mm wide and 0.3 to 0.6mm thick. They are numbered at every meter. Brass studs divide them at every 20cm.
3. Gunter’s Chain:
Length = 66ft (22 yards).
No of links = 100, Each link = 0.66ft.
Used for measuring distances in miles or furlongs (220 yards), acres (Area).
4. Engineer’s Chain
Length = 100ft.
No of links = 100, Each link = 1ft.
Used in all Engineering Surveys.
5. Revenue Chain
Length = 33ft.
No of links = 16
Commonly used for measuring fields in cadastral Survey.