There is an article by David Bick on 'Evolution of the pre-Cornish beam
engine house' in Industrial Archaeology Review,Vol 21 No 2 (1999), which you
might find helpful, although this also makes it clear that there were
considerable variations in design.
Christopher J Williams, 65 Stancliffe Avenue, Marford, Wrexham LL12 8LN
Tel: 01978 852601
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