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  Fig. 
  3.— 
  Ordii 
  

  

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  Phil. 
  Mag. 
  Ser. 
  6. 
  Vol. 
  16, 
  PL 
  II. 
  

  

  Fig. 
  5. 
  — 
  Special 
  Cast 
  Iron 
  No. 
  2. 
  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

  

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