Different Types of survey Chain.

 Different types of survey chains. ( Short Note)

1. Metric Chain

• A chain consists of different parts – i.e. brass ring (every 1m), swivel joint, link, ring, Handel, tally.
• Each Link is made of galvanized mild steel of 4 mm dia.
• Brass handle made of dia. 6mm bar.
• According to  IS: 1492-1972, surveying chains are four different type

5 m - 25 links 

10 m – 50 links

20 m – 100 links

30 m – 150 links

20-meter chain:

•  Tallies are provided at every 5 m (25 links)
•  Brass ring provide at every 1 m
•  Middle tally has two teeth (10m Tally)

         30-meter chain:

• Tallies are provided at every 5 m (25 links)
• Brass ring at every 1 m 
• Middle tally has three teeth 

2. Gunter’s  Chain:  

• Also called the surveyor’s chain
• It is a non-metric chain
• Length is 66 ft (20.12 m)
• Total links 100 
• Each link length is 0.66 ft (20.12 cm)
• Used for:  for measuring distance in miles and furlong  
• 10 chain = 1 furlong

3. Revenue Chain

• It is a non-metric chain 
• Length = 33 ft 
• Total Link = 16 links 
• Each link = 62.87 cm
• Used for: Cadastral survey  

4. Engineer’s  Chain:  

• Length = 100 ft 
• Total link = 100
• Each link = 1 ft (30.48 cm)
• Tally provide at every 10 ft
• Used for: previously used in every engineering works

5. Steel band or Band Chain:  

• Consist of 16 mm width steel ribbon
• It may be 20 m and 30 m 
• It has a brass handle
• It is graduated m, dm, cm on one side and 0.2 m mark on the other side.
• Used for: more accurate project work.