**In 1620 an english mathematician and astronomer named edmund gunter described a surveyor’s chain with 100 links, measuring 66 feet (22 yards or 4 poles) overall. By this design, one square chain equals 484 square yards, ten square chains equal an acre, and eighty chains equal a mile.**

## How Long Is a Chain in Surveying?

Chain surveying is a type of surveying that is used to measure horizontal and vertical distances. It is one of the oldest methods of surveying and is very useful in mapping out terrain.

Chain surveying is typically done with a chain that is marked off into either feet or meters. The length of the chain is important because it determines the accuracy of the measurements and the total area that can be surveyed.

A surveyor‘s chain is typically 66 feet long, but it can also be 33 feet or 100 feet long. The 100–foot chain is often used for large–scale surveys, while the 33–foot chain is used for smaller–scale surveys.

The 66–foot chain is the most commonly used chain for surveyors. The chain is composed of 100 links, each of which is 0.66 feet long.

This means that a 66–foot chain is actually composed of 66 links, and a 33–foot chain is composed of 33 links. The 100–foot chain is composed of 100 links, and so on.

The chain is divided into two parts: the measurement chain and the reference chain. The measurement chain is the part that is used to measure distances in the field. It is marked off into feet or meters and is

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