﻿LIMESTONES 
  OF 
  NEW 
  YORK 
  AND 
  THEIR 
  ECONOMIC 
  VALUE 
  387 
  

  

  If 
  33$ 
  of 
  its 
  weight 
  in 
  water 
  is 
  sprinkled 
  on 
  lime 
  it 
  heats, 
  

   cracks 
  open 
  and 
  falls 
  to 
  powder. 
  

  

  The 
  increase 
  in 
  volume 
  in 
  slaking 
  is 
  caused 
  by 
  the 
  expansive 
  

   force 
  of 
  the 
  steam. 
  Lime 
  may 
  be 
  slaked 
  without 
  increasing 
  its 
  

   volume 
  by 
  passing 
  dry 
  steam 
  over 
  it 
  in 
  a 
  tube. 
  

  

  The 
  energy 
  of 
  slaking 
  increases 
  with 
  the 
  decrease 
  of 
  impuri- 
  

   ties. 
  The 
  same 
  lime 
  may 
  show 
  a 
  varying 
  increase 
  in 
  volume 
  in 
  

   slaking 
  due 
  to 
  amount 
  of 
  water 
  added, 
  etc. 
  The 
  slow 
  addition 
  

   of 
  water 
  raises 
  less 
  heat. 
  Slaking 
  lime 
  in 
  an 
  open 
  box 
  gives 
  less 
  

   heat 
  than 
  in 
  a 
  closed 
  one. 
  

  

  With 
  an 
  equal 
  volume 
  of 
  water 
  the 
  increase 
  in 
  size 
  of 
  a 
  rich 
  

   lime 
  is 
  2$ 
  to 
  2.4$. 
  

  

  Richardson 
  illustrates 
  this 
  point 
  as 
  follows: 
  

  

  Vol. 
  of 
  H 
  2 
  Increase 
  in 
  volume 
  

   i 
  1.6 
  

  

  1 
  2.0 
  

   2i 
  2.5 
  

  

  With 
  a 
  poor 
  dolomitic 
  lime 
  it 
  was 
  

  

  2 
  1.7 
  

  

  No 
  set 
  rule 
  can 
  therefore 
  be 
  laid 
  down. 
  For 
  instance 
  1 
  peck 
  

   lump 
  lime 
  with 
  44$ 
  of 
  voids, 
  on 
  slaking 
  with 
  its 
  own 
  volume 
  of 
  

   water 
  gave 
  2J 
  pecks 
  of 
  fine 
  powder 
  of 
  slaked 
  lime. 
  

  

  From 
  1 
  peck 
  of 
  closely 
  packed 
  lime, 
  2.5 
  volumes 
  of 
  slaked 
  lime 
  

   were 
  obtained. 
  

  

  Gilmore 
  found 
  large 
  increases, 
  some 
  running 
  2.46, 
  2.83, 
  3.21, 
  

   2.40, 
  but 
  this 
  was 
  caused 
  by 
  his 
  using 
  larger 
  amounts 
  of 
  water 
  

   than 
  are 
  generally 
  taken 
  in 
  practice. 
  

  

  The 
  following 
  table 
  gives 
  the 
  tests 
  made 
  by 
  both 
  Gilmore 
  and 
  

   Richardson. 
  

  

  Rockland 
  Rondout 
  New 
  York 
  

   Gilmore 
  Richardson 
  

  

  Weight 
  of 
  lime 
  in 
  lb 
  5 
  

  

  Vol. 
  of 
  lime 
  in 
  c. 
  c 
  1557 
  

  

  Vol. 
  of 
  water 
  required 
  to 
  slake 
  2983 
  

  

  Increase 
  of 
  weight 
  in 
  $ 
  ; 
  . 
  2.24 
  

  

  Increase 
  in 
  volume 
  2.46 
  

  

  5 
  

  

  5 
  

  

  1806 
  

  

  2350 
  

  

  3300 
  

  

  2000 
  

  

  2.24 
  

  

  1.60 
  

  

  2.14 
  

  

  1.91 
  

  

  