﻿normal 
  Air- 
  Temperatures 
  of 
  the 
  Platinum- 
  Temperatures. 
  527 
  

  

  Reduction 
  to 
  degrees 
  centigrade 
  of 
  the 
  platinum-temperatures 
  

   in 
  Profs. 
  Dewar 
  and 
  Fleming's 
  low-temperature 
  obser- 
  

   vations 
  as 
  recorded 
  by 
  their 
  thermometer 
  " 
  Pi." 
  

  

  Theses-degrees 
  are 
  reduced 
  to 
  resistances 
  R 
  by 
  means 
  of 
  their 
  formula 
  

  

  " 
  R 
  = 
  -010975 
  (pt 
  +283-0) 
  " 
  

  

  on 
  p. 
  100, 
  Phil. 
  Mag. 
  July 
  1895 
  ; 
  and 
  these 
  resistances 
  are 
  then 
  converted 
  into 
  

   centigrade 
  degrees 
  by 
  formula 
  (11) 
  on 
  p. 
  453, 
  Phil. 
  Mag. 
  Dec. 
  1897, 
  viz. 
  : 
  — 
  

  

  "(R+20-529023) 
  2 
  = 
  -53270015 
  (7 
  +1048 
  -4396)." 
  

  

  pt°. 
  

  

  r° 
  C. 
  

  

  Diff. 
  for 
  

   \pt°. 
  

  

  pt°. 
  

  

  t° 
  O. 
  

  

  Diff. 
  for 
  

  

  lpt°. 
  

  

  pt°. 
  

  

  t° 
  C. 
  

  

  Diff. 
  for 
  

   1 
  pt°. 
  

  

  100 
  

  

  99 
  85 
  

  

  1016 
  

  

  - 
  30 
  

  

  - 
  28-81 
  

  

  •960 
  

  

  -160 
  

  

  - 
  149-83 
  

  

  •902 
  

   •900 
  

  

  95 
  

  

  91-77 
  

  

  1016 
  

  

  - 
  35 
  

  

  - 
  33-61 
  

  

  •956 
  

  

  -165 
  

  

  - 
  154-33 
  

  

  •898 
  

  

  90 
  

  

  8969 
  

  

  1-014 
  

  

  - 
  40 
  

  

  - 
  38-39 
  

  

  •954 
  

  

  -170 
  

  

  -158-82 
  

  

  •896 
  

  

  85 
  

  

  84-62 
  

  

  1-012 
  

  

  - 
  45 
  

  

  - 
  43-16 
  

  

  •952 
  

  

  -175 
  

  

  -16330 
  

  

  •894 
  

  

  80 
  

  

  79 
  56 
  

  

  1-008 
  

  

  - 
  50 
  

  

  - 
  47-92 
  

  

  •952 
  

  

  -180 
  

  

  -167-77 
  

  

  •890 
  

  

  75 
  

  

  74-52 
  

  

  1-006 
  

  

  - 
  55 
  

  

  - 
  52-68 
  

  

  •948 
  

  

  -185 
  

  

  -172-22 
  

  

  •890 
  

  

  70 
  

  

  69-49 
  

  

  1-004 
  

  

  - 
  60 
  

  

  - 
  57'42 
  

  

  •946 
  

  

  -190 
  

  

  -176-67 
  

  

  •888 
  

  

  65 
  

  

  64-47 
  

  

  1-01)2 
  

  

  - 
  65 
  

  

  - 
  6215 
  

  

  •942 
  

  

  -195 
  

  

  -181-11 
  

  

  •881 
  

  

  60 
  

  

  59-46 
  

  

  1-000 
  

  

  - 
  70 
  

  

  - 
  66-83 
  

  

  •942 
  

  

  -200 
  

  

  -185-53 
  

  

  •882 
  

  

  55 
  

  

  54-46 
  

  

  •998 
  

  

  - 
  75 
  

  

  - 
  71-57 
  

  

  •938 
  

  

  -205 
  

  

  -189-94 
  

  

  •880 
  

  

  50 
  

  

  49-47 
  

  

  •996 
  

  

  - 
  80 
  

  

  - 
  76-26 
  

  

  •936 
  

  

  -210 
  

  

  -194-34 
  

  

  S78 
  

  

  45 
  

  

  44-49 
  

  

  •994 
  

  

  - 
  85 
  

  

  - 
  80-94 
  

  

  •934 
  

  

  -215 
  

  

  -198-73 
  

  

  •876 
  

  

  40 
  

  

  39-52 
  

  

  •990 
  

  

  - 
  90 
  

  

  - 
  85-61 
  

  

  •932 
  

  

  —220 
  

  

  -203-11 
  

  

  '872 
  

  

  35 
  

  

  31-57 
  

  

  •988 
  

  

  - 
  95 
  

  

  - 
  90-27 
  

  

  •930 
  

  

  -225 
  

  

  -207-47 
  

  

  -870 
  

  

  30 
  

  

  29'63 
  

  

  •986 
  

  

  -100 
  

  

  - 
  94-92 
  

  

  •928 
  

  

  -230 
  

  

  -211-82 
  

  

  •870 
  

  

  25 
  

  

  24-70 
  

  

  •984 
  

  

  -105 
  

  

  - 
  9956 
  

  

  •924 
  

  

  -235 
  

  

  -216-17 
  

  

  •868 
  

  

  20 
  

  

  19-78 
  

  

  •982 
  

  

  -110 
  

  

  -104-18 
  

  

  •924 
  

  

  -240 
  

  

  -220-51 
  

  

  •864 
  

  

  15 
  

  

  14-87 
  

  

  •980 
  

  

  !-115 
  

  

  - 
  108-80 
  

  

  •922 
  

  

  -245 
  

  

  -224-83 
  

  

  •860 
  

  

  10 
  

  

  9-97 
  

  

  •978 
  

  

  -130. 
  

  

  -113-41 
  

  

  •918 
  

  

  -250 
  

  

  -229-13 
  

  

  •860 
  

  

  5 
  

  

  5-08 
  

  

  •976 
  

  

  -125 
  

  

  - 
  118-00 
  

  

  •916 
  

  

  -255 
  

  

  -233-43 
  

  

  •858 
  

  

  

  

  0-20 
  

  

  •972 
  

  

  -130 
  

  

  -122-58 
  

  

  •914 
  

  

  -260 
  

  

  - 
  237-72 
  

  

  •856 
  

  

  — 
  5 
  

  

  - 
  4-66 
  

  

  •970 
  

  

  -135 
  

  

  -12715 
  

  

  •912 
  

  

  -265 
  

  

  -242-00 
  

  

  •852 
  

  

  -10 
  

  

  - 
  9-51 
  

  

  •968 
  

  

  -140 
  

  

  -131-71 
  

  

  •908 
  

  

  -270 
  

  

  -246-26 
  

  

  '850 
  

  

  -15 
  

  

  -1435 
  

  

  •966 
  

  

  -145 
  

  

  -136-25 
  

  

  •908 
  

  

  -275 
  

  

  -250-51 
  

  

  •850 
  

  

  -20 
  

  

  -19-18 
  

  

  •964 
  

  

  -150 
  

  

  -140-79 
  

  

  •906 
  

  

  -280 
  

  

  -254'76 
  

  

  •847 
  

  

  -25 
  

  

  -2400 
  

  

  •962 
  

  

  -155 
  

  

  • 
  

  

  -145-32 
  

  

  •902 
  

  

  -283 
  

  

  -257-30 
  

  

  

  The 
  numbers 
  in 
  italics 
  are 
  outside 
  the 
  range 
  of 
  experiment. 
  

  

  