Butterley Company file of winding data for its collieries Recording information on diameter and depth of shaft, winding engines, loads, number of trams per cage, number of winds per hour, output per hour and outfit per shift of 7¼ hours winding for Bailey Brook (Kilburn and Hard Coal), Britain, Denby Hall (Nos. 1-2), Hartshay, Kirkby (North and South), New Langley, Loscoe, Lowmoor, Ollerton (Nos. 1-2, Kilburn and Low Main), Ripley, Whiteley and Hartshay (Low Main), with some annotations dated 1929-1932 [c1929]