﻿CLAYS 
  OF 
  XEW 
  YORK 
  657 
  

  

  rapidly 
  reduced 
  to 
  a 
  fine 
  state 
  of 
  division, 
  the 
  whole 
  operation 
  

   taking 
  not 
  over 
  one 
  or 
  two 
  seconds. 
  The 
  material 
  is 
  then 
  dis- 
  

   charged 
  on 
  an 
  endless 
  belt, 
  and 
  carried 
  to 
  the 
  screens. 
  The 
  dis- 
  

   integrator 
  is 
  inclosed 
  in 
  a 
  metal 
  case. 
  The 
  series 
  of 
  drums, 
  the 
  

   velocity 
  with 
  w^hich 
  they 
  revolve, 
  and 
  the 
  strength 
  and 
  the 
  arrange- 
  

   ment 
  of 
  the 
  staves 
  depend 
  on 
  the 
  hardness 
  of 
  the 
  material 
  to 
  be 
  

   pulverized, 
  and 
  also 
  on 
  the 
  degree 
  of 
  fineness 
  to 
  which 
  it 
  is 
  to 
  be 
  

   reduced. 
  By 
  varying 
  the 
  velocity 
  of 
  the 
  disintegrator 
  a 
  coarser 
  or 
  

   finer 
  product 
  is 
  obtained. 
  

  

  The 
  capacity 
  of 
  this 
  type 
  of 
  machine 
  is 
  very 
  great, 
  but 
  it 
  also 
  

   requires 
  considerable 
  power 
  to 
  operate 
  it. 
  According 
  to 
  capacity 
  

   disintegrators 
  can 
  pulverize 
  in 
  one 
  hour 
  from 
  8000 
  to 
  28,000' 
  

   pounds 
  of 
  material, 
  such 
  as 
  shale, 
  gypsum, 
  etc. 
  They 
  require 
  2 
  J 
  to 
  

   4 
  horse 
  power 
  for 
  every 
  ton 
  of 
  material 
  pulverized 
  in 
  an 
  hour. 
  

  

  Ball 
  mills. 
  These 
  consist 
  of 
  a 
  large 
  drum 
  which 
  revolves 
  on 
  a 
  

   horizontal 
  axis. 
  This 
  drum 
  contains 
  balls 
  of 
  varying 
  diameter 
  

   which 
  roll 
  over 
  each 
  other, 
  and 
  as 
  the 
  drum 
  revolves 
  comminute 
  

   the 
  particles 
  of 
  material. 
  The 
  material 
  is 
  introduced 
  through 
  a 
  

   door 
  in 
  the 
  side 
  of 
  the 
  drum, 
  the 
  door 
  is 
  then 
  closed, 
  and 
  the 
  drum, 
  

   being 
  set 
  in 
  motion, 
  ia 
  turned 
  till 
  the 
  material 
  is 
  ground 
  to 
  suffi- 
  

   cient 
  fineness. 
  It 
  is 
  then 
  discharged 
  on 
  the 
  sieve, 
  and 
  particles 
  

   which 
  will 
  not 
  pass 
  through 
  are 
  returned 
  to 
  the 
  diiim 
  together 
  with 
  

   fresh 
  material. 
  

  

  Ball 
  mills 
  were 
  at 
  first 
  constructed 
  with 
  a 
  comparatively 
  small 
  

   capacity, 
  but 
  recently 
  mills 
  have 
  been 
  constructed 
  that 
  discharge 
  

   the 
  pulverized 
  material 
  continuously. 
  A 
  still 
  more 
  recent 
  modifi- 
  

   cation 
  consists 
  in 
  introducing 
  the 
  charge 
  at 
  one 
  end 
  of 
  the 
  cylinder, 
  

   allowing 
  it 
  to 
  pass 
  the 
  whole 
  length 
  of 
  the 
  mill 
  and 
  issue 
  at 
  the 
  

   opposite 
  end. 
  As 
  the 
  breaking 
  up 
  of 
  the 
  particles 
  in 
  the 
  ball 
  mill 
  

   is 
  the 
  result 
  primarily 
  of 
  the 
  action 
  of 
  the 
  balls 
  rolling 
  over 
  them, 
  

   it 
  will 
  easily 
  be 
  seen 
  that 
  the 
  product 
  of 
  this 
  machine 
  w^ill 
  show 
  a 
  

   considerable 
  variation 
  in 
  the 
  size 
  of 
  its 
  grains, 
  and 
  that 
  the 
  thorough 
  

   pulverization 
  vdW 
  be 
  obtained 
  only 
  by 
  keeping 
  the 
  material 
  a 
  long 
  

   while 
  in 
  the 
  mill. 
  This 
  objection 
  therefore, 
  adapts 
  the 
  ball 
  mills 
  

  

  