﻿CLAYS 
  OF 
  NEW 
  YOKK 
  

  

  799 
  

  

  ' 
  The 
  different 
  stages 
  in 
  the 
  manufacture 
  of 
  pottery 
  may 
  be 
  

  

  grouped 
  as 
  follows: 
  

  

  -r, 
  . 
  ( 
  Washing 
  

  

  ir^reparation 
  ^ 
  ° 
  

  

  ( 
  Weathering 
  

  

  r 
  In 
  chaser 
  mills 
  

  

  rr^ 
  , 
  j 
  Wet 
  pans 
  

  

  Tempermg 
  { 
  

  

  1 
  l^ug 
  mills 
  

  

  I 
  Tables 
  

  

  r 
  Turning 
  

  

  T 
  r 
  1 
  T 
  I 
  Jollying 
  

  

  Moldmg 
  i 
  n 
  1- 
  

  

  I 
  Casting 
  

  

  I 
  Pressing 
  

   Drying 
  

   Burning 
  

   Glazing 
  

   Decorating 
  

   Burning 
  

  

  Preparation 
  

  

  In 
  some 
  regions 
  the 
  clay 
  is 
  prepared 
  in 
  a 
  preliminary 
  way 
  by 
  

   weathering, 
  but 
  this 
  is 
  not 
  a 
  very 
  widespread 
  custom. 
  

  

  Clays 
  for 
  common 
  earthenware 
  are 
  seldom 
  washed, 
  but 
  those 
  

   used 
  in 
  the 
  manufacture 
  of 
  stoneware, 
  specially 
  of 
  the 
  higher 
  

   grades, 
  are 
  frequently 
  prepared 
  in 
  this 
  manner; 
  those 
  clays 
  which 
  

   are 
  used 
  for 
  white 
  earthenware 
  and 
  porcelain 
  are 
  nearly 
  always 
  

   washed. 
  

  

  Clays 
  are 
  washed 
  by 
  one 
  of 
  two 
  methods. 
  With 
  the 
  first 
  method, 
  

   the 
  clay 
  is 
  thrown 
  into 
  large 
  circular 
  tubs 
  filled 
  with 
  water, 
  in 
  which 
  

   it 
  is 
  stirred 
  up 
  by 
  revolving 
  arms 
  and 
  the 
  clay 
  lumps 
  thereby 
  dis- 
  

   integrated. 
  By 
  this 
  treatment 
  the 
  fine 
  kaolinite 
  particles, 
  as 
  well 
  

   as 
  very 
  fine 
  grains 
  of 
  mica, 
  feldspar 
  and 
  quartz 
  remain 
  suspended 
  

   in 
  the 
  liquid, 
  while 
  the 
  coarser 
  grains 
  settle 
  on 
  the 
  bottom 
  of 
  the 
  

   tank. 
  The 
  water 
  with 
  the 
  suspended 
  clay 
  is 
  then 
  drawn 
  off 
  to 
  the 
  

   settling 
  tanks. 
  

  

  A 
  modification 
  of 
  this 
  consists 
  in 
  the 
  use 
  of 
  a 
  large 
  cylinder, 
  

   closed 
  at 
  both 
  ends, 
  which 
  is 
  set 
  in 
  a 
  horizontal 
  position, 
  and 
  con- 
  

  

  