Aquaculture Engineering (2+1)

Unit 1- Surveying

Chaining - Chaining on uneven or sloping ground
Two chain men are required for measuring the length of a line, which is greater than a chain length. The more experienced of the chainmen remains at the zero end or rear end of the chain and is called the follower. The other chainman holding the forward handle is known as the leader.

Unfolding the chain
To unfold a chain, the chainman keeps both the handles in the left hand and throws the rest of the portion of the chain in the forward direction with his right hand. The other chainman assists in removing the knots, etc., for making the chain straight.

Folding the Chain
Bring the two halves of the chain so as to lie along each other by pulling the chain in the middle. Commencing from the middle take two pairs of links at a time with the right hand and place them obliquely across with the left hand.