# Definition:Imperial/Length/Chain

## Definition

The chain is an imperial unit of length.

 $\displaystyle$  $\displaystyle 1$ chain $\displaystyle$ $=$ $\displaystyle 4$ rods, poles or perches $\displaystyle$ $=$ $\displaystyle 22$ yards $\displaystyle$ $=$ $\displaystyle 66$ feet $\displaystyle$ $=$ $\displaystyle 20 \cdotp 1168$ metres

## Historical Note

The chain was invented by Edmund Gunter for the purpose of land surveying.

The original Gunter's chain was a physical chain, $66$ feet in length, of $100$ links.