From: null@void.com   
      
   David Billington  writes:   
      
   > On 26/08/2025 12:13, Richard Smith wrote:   
   >> ...   
   >   
   > I saw this recently https://youtu.be/hXYrfnFP-jc?t=558 , realising it   
   > was in Cornwall you might have been there, if not some local interest   
   > processing tin ore.   
      
   Haven't seen this exact one - it is a   
   Cornish stamps.   
      
   The   
   California Stamps   
   are superior, but need rolled steel bar - which arrived with the   
   Bessemer and open-hearth steelmaking processes.   
      
   The Cornish stamps were readily made in the days of cast iron (only) -   
   and wood.   
      
   To give some idea of importance - the village of Twelveheads is just   
   down the valley - which is proudly named in honour of the stream would   
   power a set of 12 stamps heads.   
      
   They work well - both Cornish and California stamps.   
      
   King Edward Mine museum can still produce kilos of tin with its   
   California stamps readily.   
      
   My rod-mill does the same exactly the same task - for a much smaller   
   size etc.   
   But needs variable-speed drive and things which have only become readily   
   available economically in recent times.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)