carnkie
  • carnkie
  • 50.2% (Neutral)
  • Newbie Topic Starter
17 years ago
I was going to add a description but for two reasons just addded a link. The second is the extremely good diagrams.

http://www.trevithick-society.org.uk/industry/boscaswellunited.htm 
The past is a foreign country: they do things differently there.
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