﻿the 
  Electrical 
  Resistance* 
  of 
  Pure 
  Metals. 
  

  

  >23 
  

  

  taken 
  for 
  a 
  between 
  0° 
  and 
  100° 
  ; 
  these 
  being 
  taken 
  because 
  

   they 
  depend 
  upon 
  measurements 
  susceptible 
  of 
  more 
  accurate 
  

   determination 
  than 
  those 
  of 
  other 
  methods. 
  

  

  As 
  regards 
  specific 
  heats, 
  the 
  results 
  of 
  Naccari 
  (1.888) 
  

   have 
  principally 
  been 
  followed. 
  

  

  Naccari's 
  values 
  for 
  s 
  are 
  as 
  follows 
  — 
  the 
  values 
  at 
  0° 
  C 
  . 
  

   being 
  calculated 
  from 
  the 
  values 
  given 
  at 
  100° 
  0., 
  200° 
  C, 
  

   and 
  300° 
  C. 
  :— 
  

  

  

  0°. 
  

  

  •0921 
  

  

  •05449 
  

  

  •0541) 
  

  

  •02972 
  

  

  •0906 
  

  

  •2116 
  

  

  100°. 
  

  

  200°. 
  

  

  300°. 
  

  

  d. 
  

  

  Copper 
  

  

  •09422 
  

  

  •05663 
  

  

  •0570 
  

  

  •03108 
  

  

  •0951 
  

  

  •2211 
  

  

  •09634 
  

  

  •05877 
  

  

  •0594 
  

  

  03244 
  

  

  •099(5 
  

  

  •2306 
  

  

  •09846 
  

   •06091 
  

   •0617 
  

   •03380 
  

   1040 
  

   •2409 
  

  

  0002302 
  

   •0003927 
  

   •0004385 
  

   •0004575 
  

   •0004967 
  

  

  Silver 
  

  

  Cadmium 
  

  

  Lead 
  

  

  Zinc 
  

  

  Aluminium 
  

  

  •0004489 
  

  

  

  

  Naccari's 
  results 
  for 
  copper 
  are 
  not 
  in 
  accord 
  with 
  those 
  of 
  

   Bede 
  and 
  Trowbridge. 
  Thus, 
  according 
  to 
  Bede, 
  the 
  mean 
  

   value 
  of 
  s 
  between 
  15° 
  and 
  100° 
  is 
  '09331 
  ; 
  '09483 
  between 
  

   16° 
  and 
  172° 
  ; 
  and 
  '09680 
  between 
  17° 
  and 
  247°. 
  Hence, 
  

   the 
  average 
  value 
  of 
  8 
  is 
  '000516. 
  Again, 
  according 
  to 
  

   Trowbridge 
  (' 
  Science 
  Abstracts,' 
  Dec. 
  1898), 
  the 
  mean 
  value 
  

   of 
  s 
  between 
  -181° 
  and 
  13° 
  is 
  '0868, 
  and 
  '091 
  between 
  23° 
  

   and 
  100°. 
  Hence 
  the 
  average 
  value 
  of 
  8 
  is 
  '000546. 
  

  

  Naccari 
  gives 
  no 
  results 
  in 
  the 
  case 
  of 
  tin. 
  Lorenz 
  gives 
  

   the 
  following: 
  s 
  at 
  0° 
  = 
  '05368; 
  at 
  50°= 
  -05534; 
  at 
  75° 
  

   = 
  '05643. 
  Hence 
  the 
  average 
  value 
  of 
  8 
  is 
  '00064. 
  

  

  Xaccari's 
  results 
  for 
  aluminium 
  are 
  confirmed 
  by 
  those 
  of 
  

   Richards. 
  Thus, 
  according 
  to 
  Richards, 
  the 
  mean 
  value 
  of 
  s 
  

  

  and 
  

   of 
  8 
  is 
  

  

  2520 
  between 
  0° 
  and 
  

  

  "HAS 
  

  

  '2370 
  between 
  

   600°. 
  Hence 
  the 
  

  

  0°and 
  300 
  c 
  

  

  value 
  

  

  Fizeau's 
  values 
  for 
  a 
  are 
  as 
  follows 
  — 
  « 
  40 
  denoting 
  the 
  val 
  

   at 
  40° 
  C, 
  and 
  « 
  sn 
  that 
  at 
  50° 
  C, 
  :— 
  

  

  ue 
  

  

  •oooo 
  

  

  Copper 
  | 
  1678 
  

  

  Silver 
  j 
  1921 
  

  

  Cadmium 
  i 
  3069 
  

  

  Lead 
  i 
  2924 
  

  

  Zinc 
  I 
  2918 
  

  

  Aluminium 
  j 
  2313 
  

  

  Tin 
  ! 
  2234 
  

  

  a- 
  . 
  

  

  •oooo 
  

  

  1698 
  

   1936 
  

   3102 
  

   2948 
  

   2915 
  

   2336 
  

   2269 
  

  

  0- 
  

  

  •001251 
  

   •000806 
  

   001124 
  

   •000848 
  

  

  •001036 
  

   •001671 
  

  

  