That's all very helpful, Gibb.

I have all of your articles at Academia, and they include 'Grog time o day' and 'Screwing Cotton by the day' which both deal with screwing cotton. Are these different to the papers you now mention?

I need to go off and reread what you've just written so I can take it all in properly.

BTW John Venn was at Hull University when he invented Venn diagrams and one of our bridges over the River Hull near its junction with the Humber estuary is dedicated to him. I go for a walk by it once a week and we are recording some chanties and sea songs near it on Saturday.;-)