A skein is a unit of length which has been used in the UK.[1] As a measuring unit of cotton yarn or of silk, a skein equates to a "rap" or a "lea".[2] One skein is equivalent to 360 feet (109.73 m).[3]
COTTON-YARN AND SILK.
54 Inches make 1 Thread of Cotton-Yarn
80 Threads, or 120yds. 1 Skein, Rap, or Lea