PJ , a surveyor's chain is a flat steel tape. Normal one commonly used was 100yds (300') but longer and shorter ones were used also. 1 st foot is marked in inches and fractions the rest by the foot. They are very accurate used correctly. MB Mart has done a much better job describing it than I have.
Last edited by Magnum_Bob; 02/25/20.
" Cheapest velocity in the world comes from a long barrel and I sure do like them. MB "
