﻿CLAYS 
  OF 
  NEW 
  YORK 
  661 
  

  

  shaking. 
  The 
  inclined 
  screens 
  are 
  usiiallj 
  10 
  to 
  14 
  feet 
  long, 
  have 
  

   a 
  bottom 
  of 
  either 
  wire 
  cloth 
  or 
  perforated 
  metal, 
  and 
  are 
  usually 
  

   provided 
  with 
  a 
  tapping 
  device 
  to 
  keep 
  them 
  from 
  becoming 
  

   clogged. 
  Such 
  screens 
  are 
  simple 
  and 
  cheap, 
  but 
  have 
  a 
  small 
  

   capacity. 
  

  

  The 
  rotary 
  screens 
  are 
  commonly 
  of 
  wire 
  cloth, 
  and 
  have 
  a 
  

   cylindric 
  or 
  octagonal 
  form. 
  They 
  are 
  usually 
  provided 
  on 
  the 
  

   inner 
  side 
  with 
  brushes 
  to 
  keep 
  them 
  clean. 
  

  

  Shaking 
  screens 
  are 
  fixed 
  at 
  one 
  end, 
  while 
  to 
  the 
  other 
  end 
  is 
  

   attached 
  a 
  crank 
  and 
  piston 
  or 
  an 
  eccentric, 
  which 
  operates 
  them. 
  

   Such 
  screens 
  are 
  cheap 
  and 
  simple 
  in 
  operation. 
  

  

  "W^hile 
  all 
  of 
  these 
  screens 
  are 
  designed 
  to 
  perforai 
  their 
  work 
  

   automatically, 
  nevertheless 
  very 
  few 
  of 
  them 
  can 
  be 
  left 
  without 
  

   attention 
  for 
  any 
  length 
  of 
  time, 
  for 
  powdered 
  clay, 
  no 
  matter 
  how 
  

   dry 
  it 
  is 
  apparently, 
  shows 
  the 
  greatest 
  tendency 
  to 
  clog 
  the 
  meshes 
  

   of 
  almost 
  any 
  screen. 
  

  

  Molding 
  

   Soft 
  mud 
  process 
  

  

  This 
  is 
  the 
  most 
  prevalent 
  method 
  in 
  E'ew 
  York 
  state. 
  

  

  The 
  clay 
  is 
  mixed 
  with 
  water 
  to 
  the 
  consistency 
  of 
  a 
  soft 
  mud, 
  

   and 
  is 
  either 
  forced 
  into 
  a 
  wooden 
  mold 
  by 
  hand, 
  or 
  molded 
  in 
  a 
  

   machine., 
  operated 
  by 
  steam 
  or 
  horse 
  power. 
  

  

  There 
  are 
  a 
  number 
  of 
  different 
  types 
  of 
  machines 
  but 
  the 
  funda- 
  

   mental 
  principle 
  of 
  all 
  is 
  the 
  same. 
  A 
  soft 
  mud 
  machine 
  consists 
  

   essentially 
  of 
  an 
  upright 
  box 
  of 
  ', 
  wood 
  or 
  iron 
  and 
  generally 
  of 
  a 
  

   rectangular 
  shape. 
  In 
  this 
  is 
  a 
  vertical 
  shaft 
  bearing 
  several 
  knives 
  

   horizontally. 
  Attached 
  to 
  the 
  bottom 
  of 
  the 
  shaft 
  is. 
  a 
  device 
  such 
  

   as 
  a 
  curved 
  arm, 
  which 
  forces 
  the 
  clay 
  into 
  the 
  press 
  box. 
  The 
  

   molds 
  are 
  put 
  in 
  at 
  the 
  rear 
  of 
  the 
  machine 
  and 
  fed 
  forward 
  under- 
  

   neath 
  the 
  press 
  box 
  automatically. 
  The 
  empty 
  mold 
  sliding 
  into 
  

   place 
  ahovee 
  out 
  the 
  filled 
  one. 
  The 
  molds 
  before 
  being 
  placed 
  in 
  

   the 
  machine 
  are 
  sanded 
  either 
  by 
  a 
  boy, 
  or 
  else 
  in 
  an 
  automatic 
  

   mold 
  sanding 
  machine 
  in 
  order 
  to 
  prevent 
  the 
  clay 
  from 
  sticking. 
  

   The 
  clay 
  is 
  fed 
  to 
  the 
  machine 
  at 
  the 
  upper 
  end 
  of 
  the 
  box. 
  Often 
  

  

  