﻿Plate 
  91 
  

  

  To 
  laco 
  page 
  7(58 
  

  

  H. 
  Ries 
  photo. 
  

  

  Circular 
  down 
  draft 
  kiln, 
  J. 
  Lyth 
  & 
  Sons, 
  Angola. 
  

  

  