Excerpt from Engineers' Surveying Instruments: Their Construction, Adjustment, and Use

The surveyor's chain (gunter's chain) is 66 feet long, each link being inches. It is used only in find ing the area of land where the acre is the unit of measure, and is much less frequently used for this pur pose now than formerly. The 66-foot chain is used on all the U. S. Public-land surveys, and in all deeds of conveyance and other documents, when the word chain is used, it is Gunter's chain that is meant.

An engineer's chain is 100 feet long, each link be ing 1 foot. This chain is used in surveying railroads, canals, and where extensive line surveys are being con ducted. It is not infrequently employed in finding areas in acres. It is preferred to the surveyor's chain on account of its greater length, which enables one to work more rapidly and more accurately.

When the chain is folded up the links should not be parallel to each other, but should be crossed in such a manner as to touch each other in the middle, thus pre venting the bending of the links in tying up the chain. See Fig. 1.

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