﻿18 
  

  

  W. 
  P. 
  White 
  — 
  Silicate 
  Specific 
  Heats. 
  

  

  

  Interval 
  Specific 
  

  

  Heats. 
  

  

  Glasses. 
  

  

  

  

  0°-100° 
  

  

  0°-300° 
  

  

  0°-500° 
  

  

  0°-700° 
  

  

  0°-900" 
  0°-1100° 
  

  

  Silica 
  

  

  •1845 
  

  

  •2124* 
  

  

  •2302* 
  

  

  •2422 
  

  

  •2511 
  

  

  

  46 
  

  

  25* 
  

  

  03* 
  

  

  24 
  

   22 
  

   23 
  

  

  12 
  

   12 
  

  

  Anorthite 
  

  

  •1881* 
  

  

  •2152* 
  

  

  •2306* 
  

  

  •2406 
  

  

  

  

  80* 
  

  

  52* 
  

  

  03* 
  

  

  04 
  

  

  

  

  85 
  

  

  

  

  

  

  

  84 
  

  

  

  

  

  

  

  85 
  

  

  

  

  

  

  

  85 
  

  

  

  

  

  

  Andesine 
  

  

  •1932* 
  

  

  •2212* 
  

  

  

  • 
  2484 
  

  

  (2618) 
  

  

  

  36* 
  

  

  10* 
  

  

  11* 
  

  

  

  

  15 
  

   13 
  

  

  Albite 
  

  

  •1977 
  

  

  '(2236) 
  

  

  •2410 
  

  

  

  •2639 
  

  

  

  76 
  

  

  38 
  

   39 
  

  

  10 
  

  

  

  41 
  

  

  Microcline 
  

  

  •1919* 
  

  

  •2163 
  

  

  •2320 
  

  

  •2431 
  

  

  •2515 
  -2598 
  

  

  

  18* 
  

  

  63 
  

  

  21 
  

  

  22$ 
  

   22$ 
  

  

  

  14 
  99 
  

  

  Wollastonite 
  

  

  •1852* 
  

  

  •2077* 
  

  

  •2210* 
  

  

  •2356 
  

  

  

  

  53* 
  

  

  79* 
  

  

  08* 
  

   03$ 
  

  

  02$ 
  

  

  54 
  

  

  

  Diopside 
  

  

  •1934* 
  

  

  •2189* 
  

  

  •2335* 
  

  

  •2438 
  

  

  

  

  44* 
  

  

  90* 
  

  

  30* 
  

  

  40 
  

  

  

  

  38* 
  

  

  

  

  

  

  Mag.-Silicate 
  

  

  •2039 
  

  

  •2300 
  

  

  •2475 
  

  

  •2598 
  

  

  

  

  41 
  

  

  04 
  

  

  75 
  

  

  73$ 
  

  

  72$ 
  

  

  99 
  

  

  

  * 
  Preliminary 
  determination. 
  

   $ 
  Platinum 
  furnace 
  at 
  500°. 
  

  

  Table 
  V. 
  

  

  Mean 
  Atomic 
  Weights, 
  or 
  Molecular 
  Weights 
  divided 
  by 
  the 
  number 
  of 
  

   atoms, 
  used 
  as 
  Multipliers 
  to 
  reduce 
  Specific 
  Heat 
  to 
  Mean 
  Atomic 
  Heat. 
  

  

  Silica 
  20-1 
  

  

  Calcium 
  Metasilicate 
  23-27 
  

  

  Magnesium 
  Metasilicate 
  20-12 
  

  

  Diopside 
  21-70 
  

  

  Anorthite 
  21-45 
  

  

  Andesine 
  20-84 
  

  

  Natural 
  albite 
  20-33 
  

  

  Natural 
  microcline 
  21-23 
  

  

  The 
  andesine 
  is 
  more 
  exactly 
  A^An^ 
  The 
  compositions 
  taken 
  for 
  micro- 
  

   cline 
  and 
  albite 
  were 
  those 
  found 
  by 
  E. 
  T. 
  Allen* 
  for 
  Mitchell 
  Co. 
  N. 
  C. 
  

   orthoclase 
  and 
  Mitchell 
  Co. 
  N. 
  C. 
  albite, 
  without 
  H 
  2 
  0. 
  

  

  * 
  A. 
  L. 
  Day 
  and 
  E. 
  T. 
  Allen, 
  The 
  Isomorphism 
  and 
  Thermal 
  Properties 
  

   of 
  the 
  Feldspars, 
  this 
  Journal, 
  19, 
  119, 
  1905. 
  The 
  densities 
  of 
  these 
  min- 
  

   erals 
  and 
  their 
  glasses 
  are 
  given 
  in 
  this 
  paper 
  ; 
  those 
  of 
  nearly 
  all 
  the 
  others 
  

   in 
  the 
  Smithsonian 
  Physical 
  Tables, 
  6th 
  Eevised 
  Edition. 
  

  

  