"Imperial Measures of Length" megalithic yard http://gwydir.demon.co.uk/jo/units/length.htm#small Imperial Measures of Length "Imperial Measures of Length" Standard Origins of different measurements - including nautical info http://gwydir.demon.co.uk/jo/units/length.htm#small Small units Small units span = 9â "Imperial Measures of Length" « Imperial Measures of Length: Small units » Imperial Measures of Length "Imperial Measures of Length" "Small units" Ramsden's chain Standard Small units Standard length Imperial Measures of Length imperial system of measurement Imperial Measures of Length Small units Small units Small units "Small units" Origins of different measurements - including nautical info "Small units" "Small units" Origins of different measurements - including nautical info