﻿LIMESTONES 
  OF 
  NEW 
  YORK 
  AND 
  THEIR 
  ECONOMIC 
  VALUE 
  419 
  

  

  The 
  raw 
  materials 
  for 
  cement 
  enter 
  this 
  kiln 
  in 
  dry 
  powdered 
  

   form 
  by 
  a 
  spout 
  at 
  the 
  upper 
  end 
  and 
  are 
  carried 
  forward 
  and 
  

   downward 
  by 
  the 
  revolution 
  of 
  the 
  furnace 
  towards 
  the 
  fireplace 
  

   at 
  the 
  lower 
  end, 
  the 
  burnt 
  clinker 
  finally 
  falling 
  out 
  of 
  an 
  open- 
  

   ing 
  at 
  the 
  lower 
  end 
  of 
  the 
  cylinder. 
  Certain 
  improvements 
  in 
  

   the 
  way 
  of 
  auxiliary 
  cylinders 
  for 
  regenerating 
  the 
  heat 
  in 
  hot 
  

   clinker 
  have 
  been 
  perfected, 
  and 
  the 
  Atlas 
  cement 
  co. 
  has 
  also 
  

   worked 
  out 
  a 
  scheme 
  for 
  sprinkling 
  and 
  cooling 
  the 
  clinker 
  in 
  a 
  

   third 
  cylinder 
  so 
  that 
  when 
  discharged 
  from 
  this 
  it 
  will 
  be 
  ready 
  

   for 
  immediate 
  grinding 
  in 
  the 
  mill. 
  a 
  

  

  At 
  Yanktown, 
  S. 
  D. 
  the 
  Johnson 
  type 
  of 
  kiln 
  is 
  used. 
  This 
  is 
  

   quite 
  similar 
  to 
  the 
  dome 
  kilns 
  but 
  has 
  long 
  horizontal 
  flues 
  

   between 
  the 
  kilns 
  and 
  a 
  central 
  chimney. 
  In 
  this 
  flue 
  and 
  on 
  

   top 
  of 
  it 
  the 
  wet 
  slurry 
  is 
  deposited 
  and 
  is 
  dried 
  by 
  the 
  products 
  

   of 
  combustion. 
  The 
  kiln 
  is 
  then 
  recharged 
  by 
  taking 
  up 
  the 
  

   dried 
  slurry 
  from 
  the 
  bottom 
  of 
  the 
  flue 
  and 
  placing 
  it 
  with 
  

   layers 
  of 
  coke 
  in 
  the 
  kiln. 
  

  

  The 
  Dietzch 
  type 
  of 
  kiln 
  is 
  also 
  used 
  especially 
  in 
  Ohio. 
  This 
  

   kiln 
  is 
  the 
  most 
  successful 
  of 
  the 
  German 
  kilns 
  at 
  the 
  present 
  

   time, 
  being 
  specially 
  economical, 
  in 
  fuel 
  and 
  producing 
  a 
  much 
  

   larger 
  output 
  than 
  any 
  form 
  of 
  noncontinuous 
  kiln. 
  

  

  In 
  1893 
  the 
  Coplay 
  cement 
  co. 
  built 
  a 
  kiln 
  of 
  the 
  Schoefer 
  or 
  

   Aalborg 
  type 
  which 
  is 
  quite 
  similar 
  in 
  its 
  conception 
  to 
  the 
  

   Dietzch 
  kiln, 
  but 
  instead 
  of 
  an 
  offset 
  in 
  the 
  shaft 
  it 
  is 
  narrowed 
  

   in 
  the 
  center 
  above 
  the 
  stoke-holes 
  so 
  as 
  to 
  produce 
  a 
  high 
  tem- 
  

   perature 
  in 
  a 
  narrow 
  zone. 
  This 
  kiln 
  is 
  also 
  economical 
  in 
  fuel 
  

   but 
  like 
  the 
  Dietzch 
  kiln 
  is 
  rather 
  expensive 
  in 
  manual 
  labor. 
  

   The 
  Coplay 
  co. 
  built 
  eight 
  more 
  of 
  these 
  in 
  1893, 
  and 
  the 
  year 
  

   following 
  the 
  Glens 
  Falls 
  cement 
  works, 
  of 
  Glens 
  Falls, 
  N. 
  Y. 
  

   built 
  six 
  of 
  them. 
  In 
  1896 
  the 
  White 
  cliffs 
  portland 
  cement 
  co. 
  

   of 
  Arkansas 
  built 
  a 
  plant 
  also 
  with 
  Schoefer 
  kilns. 
  Fig. 
  6 
  shows 
  

   a 
  section 
  of 
  the 
  Aalborg 
  kilns. 
  

  

  In 
  1897 
  designs 
  were 
  under 
  consideration 
  for 
  a 
  continuous 
  kiln 
  

   of 
  the 
  French 
  type, 
  approaching 
  in 
  general 
  scheme 
  and 
  outline 
  

  

  aMost 
  of 
  this 
  description 
  of 
  the 
  process 
  of 
  burning 
  is 
  taken 
  from 
  Lewis's 
  article 
  in 
  

   .Mineral 
  industry, 
  p. 
  7, 
  already 
  referred 
  to. 
  

  

  