Gunter's chain.
Gunter's chain is a 66-foot (22-yard) long measuring chain with 100 links, developed by Edmund Gunter in 1620 for surveying and land measurement. It was a crucial tool for nearly 300 years, with brass tags marking every
10 links to simplify calculations, as 10 square chains equal one acre. Gunter's chain was the primary means of measuring land and was widely used across the British Empire, influencing city planning.The chain was eventually
replaced by the steel tape in the late 19th century.
How it was used
2 brass handles, 9 brass tags one marked 'warranted correct' and 3 Swivel joints. Length: 66 feet (or 22 yards) Links: 100 links per chain. Link length: Each link is 7.92 inches long
Tags: Brass tags are located at every 10th link, with the number of points on the tag indicating its position (e.g., 1 point for 10 links, 2 points for 20 links)
Handles: A handle is located at each end of the chain
Applications and significance
The chain was used to measure the area of land plots. Its design simplified area calculations, as one acre is equal to 10 square chains. It was also used for other distance measurements; for example, a cricket pitch is
one chain long.
The two ends of the chain were held by two surveyors, who would stretch the chain out over the distance to be measured. The chain was designed to be pulled taut and held flat on the ground. The tags on the chain helped with
counting and calculating distances.
Land surveying measuring chain
100 feet chain similar to Gunter's chain but covers a longer distance. So it is Imperial measure made by Chesterman of Sheffield. Probably 1950s 0r 1960s.
10 chains = 1 furlong. 8 furlongs =1 mile.
1 chain subdivided 100 links. Each link = 7.92 ins.
1 chain = 4 rods or 4 perches each 16.5 ft.
1 cricket pitch = 1 chain. Also used still by railways.
The weights and measures act 1985 still confirms chains as a valid measurement but they are no longer used as a current measurement term
Land surveying measuring chain No. 2.
20 metres chain similar to Gunter's chain but covers a longer distance. So it is metric measure equivalent to 65 feet. Difficult to date but could be 1980s because it no longer has brass tags but plastic ones and the
measurement is metric.
The weights and measures act 1985 still confirms chains as a valid measurement but they are no longer used as a current measurement term.