﻿CLAYS 
  OF 
  NEW 
  YORK 
  

  

  557 
  

  

  Composition 
  and 
  fusing 
  points 
  of 
  Seger 
  cones 
  (continued) 
  

  

  No. 
  of 
  cone 
  

  

  Composition 
  

  

  23 
  

   24 
  

   25 
  

   26 
  

  

  27 
  

  

  28 
  

   29 
  

   30 
  

   31 
  

   3i 
  

   33 
  

   34 
  

   35 
  

   36 
  

  

  Fusing 
  point 
  

  

  0.3 
  

  

  0.7 
  

   0.3 
  

  

  0.7 
  

  

  CaO 
  f 
  

  

  CaO 
  

  

  K2O 
  

  

  CaO 
  ( 
  

  

  K,0 
  

  

  CaO 
  

  

  K2O 
  

  

  CaO 
  

  

  'F 
  

  

  5.4 
  

  

  6.0 
  

  

  e.6 
  

  

  7.2 
  

  

  AI2O3 
  54 
  

   AI2O3 
  60 
  

   AI2O3 
  66 
  

   AlA 
  72 
  

  

  20 
  ALO,200 
  

  

  AlgOs 
  

   AI2O3 
  

   AI2O3 
  

   AI2O3 
  

   AI2O3 
  

   AI2O3 
  

   AI2O3 
  

   AI2O3 
  

   AI2O3 
  

  

  10 
  

   8 
  

   6 
  

   5 
  

   4 
  

   3 
  

  

  2.5 
  

   2 
  

   1.5 
  

  

  Si02 
  

  

  Si02 
  

  

  Si02 
  

  

  Si02 
  

  

  Si02 
  

   Si02 
  

  

  Si02 
  

   8i02 
  

   SiOs 
  

   Si02 
  

   Si02 
  

   SiOa 
  

   Si02 
  

  

  Si02 
  

  

  2 
  

  

  .M*4 
  

  

  2 
  

  

  930 
  

  

  2 
  

  

  y66 
  

  

  3 
  

  

  002 
  

  

  3 
  

  

  038 
  

  

  3 
  

  

  74 
  

  

  3 
  

  

  110 
  

  

  3 
  

  

  140 
  

  

  3 
  

  

  1.S2 
  

  

  3 
  

  

  218 
  

  

  3 
  

  

  254 
  

  

  3 
  

  

  290 
  

  

  3 
  

  

  326 
  

  

  3 
  

  

  362 
  

  

  I 
  590 
  

  

  1 
  610 
  

  

  I 
  6:-;0 
  

  

  1 
  6f.O 
  

  

  1 
  670 
  

  

  I 
  690 
  

   1 
  710 
  

   I 
  730 
  

   750 
  

   770 
  

   790 
  

  

  I 
  felO 
  

  

  830 
  

   850 
  

  

  The 
  theory 
  of 
  these 
  pyramids 
  is 
  that 
  the 
  cone 
  bends 
  over 
  as 
  the 
  

   temperature 
  approaches 
  its 
  fusing 
  point. 
  If 
  the 
  heat 
  is 
  raised 
  too 
  

   rapidly 
  the 
  cones 
  which 
  contain 
  much 
  iron 
  swell 
  and 
  blister 
  and 
  do 
  

   not 
  bend 
  over, 
  so 
  the 
  best 
  results 
  are 
  obtained 
  by 
  the 
  slow 
  softening 
  

   of 
  the 
  cone 
  under 
  a 
  gradually 
  rising 
  temperature. 
  For 
  practical 
  

   purposes 
  these 
  cones 
  are 
  considered 
  sufficiently 
  accurate. 
  

  

  In 
  actual 
  use 
  they 
  are 
  placed 
  in 
  the 
  kiln 
  at 
  a 
  point 
  where 
  they 
  

   can 
  be 
  watched 
  through 
  a 
  peep 
  hole 
  but 
  at 
  the 
  same 
  time 
  will 
  not 
  

   receive 
  the 
  direct 
  touch 
  of 
  the 
  flame 
  from 
  the 
  fuel. 
  It 
  is 
  always 
  

   ■well 
  to 
  put 
  two 
  or 
  more 
  cones 
  in 
  the 
  kiln, 
  so 
  that 
  warning 
  can 
  be 
  

   had 
  not 
  only 
  of 
  the 
  approach 
  of 
  the 
  desired 
  temperature, 
  but 
  also 
  of 
  

   the 
  rapidity 
  with 
  which 
  the 
  temperature 
  is 
  rising. 
  

  

  In 
  order 
  to 
  determine 
  the 
  temperature 
  of 
  a 
  kiln 
  several 
  cones 
  of 
  

   separated 
  numbers 
  are 
  put 
  in, 
  as 
  for 
  example: 
  .07, 
  1, 
  and 
  5. 
  Sup- 
  

   pose 
  .07 
  and 
  1 
  are 
  bent 
  over 
  in 
  burning 
  but 
  5 
  is 
  not 
  affected, 
  the 
  

   temperature 
  of 
  the 
  kiln 
  is 
  between 
  1 
  and 
  5. 
  The 
  next 
  time 
  nos. 
  2, 
  3 
  

  

  