﻿42 
  

  

  W. 
  P. 
  White 
  — 
  Silicate 
  Specific 
  Heats. 
  

  

  of 
  all 
  made 
  it 
  seem 
  probable 
  that 
  albite 
  is 
  nearly 
  1 
  per 
  

   mille 
  in 
  error. 
  This 
  table 
  has 
  already 
  been 
  used 
  as 
  evi- 
  

   dence 
  of 
  the 
  small 
  part 
  played 
  by 
  both 
  rapidly-vary- 
  

   ing 
  (" 
  accidental 
  ") 
  and 
  slowly-varying 
  ("concealed") 
  

   errors, 
  as 
  well 
  as 
  systematic 
  errors 
  constant 
  for 
  the 
  dif- 
  

   ferent 
  substances. 
  

  

  The 
  differences 
  in 
  Table 
  X 
  appear 
  to 
  suggest 
  questions 
  

   rather 
  than 
  conclusions 
  beyond 
  those 
  already 
  considered. 
  

  

  Table 
  X. 
  

  

  Interval 
  Atomic 
  Heats 
  of 
  Silicates, 
  compared 
  by 
  "being 
  given 
  as 
  differences 
  

   from 
  a 
  fictitious 
  standard 
  silicate. 
  

  

  Silicate, 
  minus 
  standard. 
  

  

  MgSiO., 
  

  

  Amphibole 
  

  

  MgSiO 
  ;i 
  

  

  Pyroxene 
  

  

  Diopside 
  

  

  PW 
  -f 
  Py 
  

  

  2 
  

   P. 
  Woll. 
  

   Woll. 
  

   Anorthite 
  

   Andesine 
  

   Anor. 
  -J- 
  Alb. 
  

  

  2 
  

   Albite 
  

   Micro 
  cline 
  

   Micro, 
  glass 
  

  

  0-100° 
  

  

  •023 
  

  

  •036 
  

   •108 
  

  

  129 
  

   223 
  

  

  012 
  

   055 
  

  

  048 
  

   107 
  

   096 
  

   006 
  

  

  0-300° 
  

  

  036 
  

  

  059 
  

   109 
  

  

  115 
  

  

  170 
  

  

  (008) 
  

  

  — 
  109 
  

  

  — 
  114 
  

  

  •003 
  

  

  0-500° 
  

  

  039 
  

  

  084 
  

   108 
  

  

  111 
  

  

  137 
  

  

  013 
  

   056 
  

  

  048 
  

   108 
  

   112 
  

   013 
  

  

  0-700° 
  

   •039 
  

  

  •109 
  

  

  •113 
  

  

  •149 
  

   •001 
  

   -057 
  

  

  -056 
  

   -113 
  

   -112 
  

   •017 
  

  

  0-900° 
  

  

  •038 
  

   •109 
  

  

  093 
  

   139 
  

   006 
  

   053 
  

  

  052 
  

   109 
  

   116 
  

   021 
  

  

  0-1100° 
  

  

  •043 
  

   •107 
  

  

  •082 
  

   •136 
  

   •019 
  

  

  —107 
  

  

  — 
  186 
  

  

  •06.3 
  

  

  Standard 
  alone 
  4-067 
  

  

  4-588 
  

  

  4-913 
  

  

  5-143 
  

  

  5-316 
  

  

  5-453 
  

  

  The 
  three 
  italized 
  values 
  differ 
  more 
  than 
  1 
  per 
  mille 
  from 
  the 
  probable 
  

   smooth 
  curve. 
  

  

  Summary. 
  

  

  Specific 
  heats 
  of 
  various 
  silicates 
  and 
  forms 
  of 
  silica 
  

   have 
  been 
  determined 
  for 
  upper 
  temperatures 
  from 
  100° 
  

   to 
  1400°. 
  The 
  method 
  was 
  by 
  dropping 
  from 
  furnaces 
  

   into 
  calorimeters. 
  A 
  rather 
  unusual 
  number 
  of 
  checks 
  

   and 
  precautions 
  against 
  error 
  was 
  employed, 
  which 
  are 
  

   described 
  in 
  detail. 
  Two 
  apparently 
  new 
  methods 
  are 
  

   described 
  for 
  determining 
  true 
  or 
  atomic 
  heats 
  from 
  

   interval 
  heats. 
  

  

  On 
  the 
  whole, 
  the 
  general 
  temperature 
  variation 
  of 
  the 
  

   specific 
  heats 
  is 
  one 
  depending 
  mainly 
  upon 
  the 
  value 
  of 
  

   v, 
  an 
  atomic 
  vibration 
  period, 
  assignable 
  to 
  oxygen 
  in 
  

   combination. 
  

  

  