﻿LIMESTONES 
  OF 
  NEW 
  YORK 
  AND 
  THEIR 
  ECONOMIC 
  VALUE 
  385 
  

  

  Fat 
  limes 
  which 
  slake 
  quickly 
  and 
  fall 
  easily 
  to 
  a 
  fine 
  light 
  

   powder 
  absorb 
  chlorin 
  much 
  quicker 
  than 
  lean 
  limes, 
  which 
  on 
  

   slaking 
  give 
  a 
  sandy 
  powder 
  even 
  when 
  analysis 
  points 
  out 
  each 
  

   as 
  almost 
  pure 
  and 
  shows 
  no 
  difference. 
  In 
  addition 
  chlorid 
  of 
  

   lime 
  made 
  from 
  fat 
  lime 
  keeps 
  much 
  better 
  than 
  when 
  made 
  from 
  

   lean 
  lime 
  (Wright, 
  Chem. 
  news, 
  16:426) 
  

  

  Glass 
  making 
  

  

  According 
  to 
  Mr 
  J. 
  D. 
  Weeks 
  lime 
  is 
  of 
  considerable 
  impor- 
  

   tance 
  in 
  glass 
  manufacture. 
  " 
  Glass 
  rich 
  in 
  lime 
  requires 
  a 
  

   higher 
  temperature 
  to 
  melt 
  and 
  because 
  of 
  this 
  is 
  more 
  destruc- 
  

   tive 
  to 
  the 
  pots, 
  but 
  used 
  in 
  proper 
  proportions 
  it 
  promotes 
  the 
  

   fusion, 
  aids 
  in 
  the 
  decomposition 
  of 
  the 
  materials, 
  and 
  improves 
  

   the 
  quality 
  of 
  the 
  glass. 
  Lime 
  glass 
  can 
  not 
  compete 
  with 
  lead 
  

   glass 
  in 
  brilliancy, 
  but 
  it 
  is 
  harder, 
  not 
  so 
  easily 
  scratched, 
  holds 
  

   its 
  polish 
  longer, 
  is 
  more 
  elastic 
  and 
  consequently 
  tougher, 
  will 
  

   stand 
  higher 
  temperature, 
  resists 
  the 
  action 
  of 
  water 
  and 
  chemi- 
  

   cal 
  agents 
  and 
  is 
  much 
  more 
  cheaply 
  produced. 
  Lime 
  glass 
  also 
  

   on 
  account 
  of 
  the 
  slight 
  difference 
  in 
  specific 
  gravity 
  of 
  the 
  two 
  

   substances 
  composing 
  it 
  is 
  less 
  liable 
  to 
  become 
  striated. 
  In 
  

   the 
  manufacture 
  of 
  plate 
  glass, 
  which 
  is 
  ground 
  and 
  polished, 
  it 
  

   is 
  found 
  that 
  glass 
  which 
  is 
  rich 
  in 
  lime 
  is 
  harder 
  to 
  polish 
  than 
  

   that 
  poor 
  in 
  lime, 
  but 
  it 
  holds 
  its 
  polish 
  better 
  and 
  longer.'' 
  It 
  

   may 
  devitrify 
  from 
  the 
  presence 
  of 
  excess 
  of 
  lime, 
  as 
  when 
  an 
  ex- 
  

   cess 
  of 
  lead 
  or 
  sand 
  is 
  used. 
  The 
  lime 
  should 
  be 
  as 
  free 
  from 
  

   impurities 
  as 
  possible, 
  specially 
  oxid 
  of 
  iron. 
  

  

  Below 
  are 
  given 
  two 
  analyses, 
  no. 
  1 
  from 
  Blair 
  co. 
  Pa. 
  and 
  no. 
  2 
  

   from 
  Sandusky, 
  O. 
  The 
  former 
  is 
  used 
  for 
  window 
  glass, 
  the 
  lat- 
  

   ter 
  for 
  lime 
  ftint 
  glass. 
  

  

  1 
  2 
  

  

  Organic 
  matter 
  .09 
  .05 
  

  

  Silica 
  1.01 
  1.00 
  

  

  Alumina 
  .02 
  .40 
  

  

  Ferric 
  carbonate 
  . 
  165 
  

  

  Magnesium 
  carbonate 
  1.48 
  41.43 
  

  

  Lime 
  carbonate 
  97.23 
  56.60 
  

  

  Ferric 
  oxid 
  .12 
  

  

  Moisture 
  .40 
  

  

  flMineral 
  resources 
  of 
  U. 
  S. 
  1883-84, 
  p. 
  968. 
  

  

  