﻿S02 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  kaolin 
  fall 
  on 
  the 
  screen, 
  and 
  pass 
  tlirongli, 
  otherwise 
  they 
  run 
  off 
  

   and 
  are 
  lost. 
  A 
  slight 
  improvement 
  is, 
  to 
  have 
  two 
  or 
  three 
  

   screens 
  overlapping 
  one 
  another, 
  so 
  that 
  whatever 
  does 
  not 
  get 
  

   through 
  the 
  first 
  will 
  fall 
  on 
  the 
  second. 
  If 
  the 
  vegetable 
  matter 
  

   and 
  sticks 
  are 
  allowed 
  to 
  accumulate, 
  they 
  clog 
  the 
  screen, 
  and 
  

   prevent 
  the 
  kaolin 
  from 
  running 
  through; 
  consequently 
  stationary 
  

   screens 
  must 
  be 
  closely 
  watched. 
  

  

  The 
  revolving 
  screens 
  are 
  fai* 
  better; 
  for 
  they 
  are 
  self-cleansing. 
  

   Such 
  screens 
  are 
  barrel-shaped, 
  and 
  the 
  water, 
  with 
  the 
  kaolin 
  in 
  

   suspension, 
  is 
  discharged 
  into 
  the 
  interior 
  and 
  passes 
  outward 
  

   through 
  the 
  screen 
  cloth. 
  As 
  the 
  screen 
  revolves 
  the 
  dirt 
  caught 
  

   is 
  carried 
  upward 
  and 
  finally 
  drops; 
  but, 
  instead 
  of 
  falling 
  down 
  

   on 
  the 
  other 
  side 
  of 
  the 
  screen, 
  it 
  falls 
  on 
  a 
  board, 
  which 
  diverts 
  it 
  

   out 
  to 
  the 
  ground. 
  

  

  The 
  settling 
  tanks, 
  into 
  which 
  the 
  kaolin 
  and 
  the 
  water 
  are 
  dis- 
  

   charged, 
  may 
  be 
  and 
  often 
  are 
  about 
  8 
  feet 
  wide 
  by 
  4 
  feet 
  deep 
  

   and 
  50 
  or 
  more 
  feet 
  long. 
  As 
  soon 
  as 
  one 
  is 
  filled 
  the 
  water 
  is 
  

   diverted 
  into 
  another. 
  The 
  larger 
  a 
  tank 
  the 
  longer 
  it 
  will 
  take 
  

   to 
  fill 
  it, 
  and 
  allow 
  the 
  kaolin 
  to 
  settle. 
  Clays 
  obtained 
  in 
  this 
  

   manner 
  are 
  expensive, 
  particularly 
  when 
  the 
  market 
  takes 
  the 
  out- 
  

   put 
  of 
  washed 
  kaolin 
  as 
  soon 
  as 
  it 
  is 
  ready. 
  Small 
  tanks 
  have 
  the 
  

   advantage 
  of 
  permitting 
  the 
  slip 
  to 
  dry 
  more 
  quickly, 
  specially 
  

   when 
  the 
  layer 
  of 
  clay 
  is 
  not 
  very 
  thick; 
  furthermore 
  a 
  small 
  pit 
  

   takes 
  less 
  time 
  to 
  fill 
  and 
  empty. 
  But 
  one 
  disadvantage 
  urged 
  

   against 
  a 
  number 
  of 
  small 
  tanks 
  is 
  that 
  a 
  thoroughly 
  average 
  prod- 
  

   uct 
  is 
  not 
  obtained, 
  owing 
  to 
  the 
  thinness 
  of 
  the 
  layer 
  of 
  settlings 
  

   and 
  the 
  small 
  amount 
  in 
  each. 
  In 
  addition 
  a 
  series 
  of 
  small 
  tanks 
  

   require 
  considerable 
  room. 
  The 
  advantages 
  asserted 
  in 
  the 
  case 
  

   of 
  large 
  tanks 
  are 
  that 
  the 
  clay 
  can 
  be 
  discharged 
  into 
  any 
  one 
  for 
  

   a 
  considerable 
  period, 
  and, 
  if 
  the 
  clay 
  deposit 
  varies 
  in 
  character, 
  

   the 
  different 
  grades 
  get 
  into 
  one 
  tank 
  and 
  a 
  better 
  average 
  is 
  

   thereby 
  obtained. 
  

  

  If 
  the 
  kaolin 
  settles 
  too 
  slowly, 
  alum 
  is 
  sometimes 
  added 
  to 
  the 
  

   water 
  to 
  hasten 
  the 
  deposition. 
  When 
  the 
  kaolin 
  has 
  settled, 
  

  

  