sentence: proportions to other customary units - 1 link ≡ align = right 0.01 chain - ≡ align = right 0.04 rod - ≡ align = right 0.66 foot - ≡ align = right 0.22 yard - ≡ align = right 7.92 inch -rcb- history edmund gunter designed and introduced the gunter 's chain in england in 1620 .