1) Noted in colliery accounts; a metal hook of some kind, possibly a coupling hook.
References date from 1734 in Colsterdale and a little later in the West Riding: 1754 to a Barrow Crook 8d, Beeston
1840 To 2 Small rods and 3 barrow crooks 4s 0d, Tong. The ‘barrows’ referred to in that late period were possibly wooden corves. Elsewhere, thre crockes or hooks were part of the clatch harness.