﻿664 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  The 
  effect 
  of 
  a 
  difference 
  in 
  velocity 
  between 
  the 
  central 
  and 
  

   outer 
  portions 
  of 
  the 
  clay 
  stream 
  is 
  to 
  produce 
  a 
  laminated 
  structure 
  

   in 
  the 
  brick. 
  Plastic 
  clays 
  laminate 
  more 
  than 
  lean 
  ones, 
  and 
  even 
  

   the 
  same 
  clay 
  may 
  laminate 
  more 
  with 
  one 
  die 
  than 
  with 
  another. 
  

   Irregularity 
  of 
  clay 
  supply 
  may 
  be 
  still 
  another 
  cause. 
  In 
  common 
  

   brick 
  laminations 
  are 
  less 
  harmful 
  than 
  in 
  paving 
  brick; 
  repress- 
  

   ing 
  may 
  at 
  times 
  obliterate 
  them 
  to 
  a 
  large 
  extent. 
  The 
  

   auger 
  machine 
  is 
  extensively 
  used 
  at 
  the 
  present 
  day, 
  spe- 
  

   cially 
  in 
  the 
  manufacture 
  of 
  paving 
  brick. 
  It 
  has 
  a 
  large 
  capacity, 
  

   60,000 
  brick 
  being 
  not 
  an 
  unusual 
  output 
  for 
  10 
  hours. 
  The 
  

   capacity 
  of 
  the 
  auger 
  machine 
  is 
  often 
  increased 
  by 
  causing 
  two 
  

   streams 
  of 
  clay 
  to 
  issue 
  from 
  it, 
  and 
  certain 
  machines 
  are 
  said 
  to 
  

   have 
  produced 
  150,000 
  brick 
  a 
  day. 
  Plunger 
  machines 
  have 
  a 
  

   capacity 
  of 
  25,000 
  to 
  30,000 
  a 
  day. 
  

  

  Building 
  brick 
  are 
  mostly 
  side^cut, 
  while 
  paving 
  brick 
  are 
  com- 
  

   monly 
  end-cut. 
  

  

  If 
  the 
  brick 
  are 
  to 
  be 
  facing, 
  they 
  are 
  repressed, 
  for 
  the 
  purpose 
  

   of 
  straightening 
  their 
  edges 
  and 
  smoothing 
  the 
  surface. 
  

  

  Dry 
  clay 
  process 
  

  

  The 
  use 
  of 
  this 
  method 
  in 
  the 
  United 
  States 
  dates 
  back 
  15 
  or 
  20 
  

   years, 
  to 
  its 
  introduction 
  at 
  Louisville, 
  Ky. 
  In 
  'New 
  York 
  it 
  has 
  

   not 
  been 
  in 
  use 
  over 
  nine 
  years. 
  There 
  are 
  fiv© 
  dry 
  press 
  in 
  works 
  

   in 
  the 
  state. 
  The 
  clay 
  after 
  being 
  dug 
  is 
  usually 
  stored 
  in 
  sheds 
  

   to 
  dry. 
  "When 
  ready 
  for 
  use 
  it 
  is 
  taken 
  out 
  and 
  charged 
  into 
  the 
  

   disintegrator 
  or 
  dry 
  pan, 
  both 
  of 
  which 
  have 
  been 
  described 
  under 
  

   " 
  Preparation 
  of 
  clay." 
  

  

  After 
  passing 
  from 
  the 
  disintegrator 
  the 
  powdered 
  clay 
  is 
  car- 
  

   ried 
  by 
  an 
  elevator 
  to 
  the 
  upper 
  story, 
  where 
  it 
  is 
  discharged 
  on 
  a 
  

   long 
  screen 
  inclined 
  at 
  an 
  angle 
  of 
  about 
  45°. 
  The 
  material 
  

   which 
  has 
  been 
  ground 
  fine 
  enough 
  passes 
  through 
  the 
  sieve 
  and 
  

   down 
  into 
  the 
  hopper 
  over 
  the 
  molding 
  machine. 
  The 
  tailings 
  fall 
  

   into 
  a 
  hopper 
  at 
  the 
  lower 
  end 
  of 
  the 
  sieve 
  and 
  are 
  carried 
  back 
  to 
  

   the 
  disintegrator. 
  

  

  I 
  

  

  