﻿J532 
  Dr. 
  Beattie 
  and 
  Mr. 
  Morrison 
  on 
  the 
  

  

  zinc; 
  while 
  in 
  the 
  case 
  of 
  the 
  remaining 
  metals, 
  the 
  relation 
  

   cannot 
  at 
  present 
  be 
  tested. 
  

  

  (4) 
  A 
  relation 
  — 
  = 
  -? 
  at 
  the 
  temperature 
  o£ 
  fusion, 
  

  

  (T 
  s 
  \ 
  s 
  

  

  roughly 
  true 
  for 
  lead, 
  cadmium, 
  tin, 
  and 
  zinc, 
  the 
  only 
  

   metals 
  for 
  which, 
  at 
  present, 
  it 
  can 
  be 
  tested. 
  

  

  The 
  results, 
  however, 
  in 
  many 
  respects 
  are 
  incomplete 
  

   and 
  unsatisfactory, 
  as 
  of 
  course 
  is 
  to 
  be 
  expected 
  from 
  the 
  

   imperfect 
  character 
  of 
  their 
  experimental 
  basis. 
  Perhaps, 
  

   however, 
  the 
  paper 
  — 
  in 
  spite 
  of 
  its 
  imperfections, 
  may 
  prove 
  

   useful 
  as 
  a 
  statement 
  of 
  what 
  may 
  be 
  done 
  to 
  correlate 
  

   expansion-coefficients, 
  specific 
  heats, 
  and 
  electrical 
  resistances, 
  

   and 
  that 
  it 
  may 
  do 
  good 
  by 
  calling 
  attention 
  to 
  the 
  matter, 
  

   and 
  stimulating 
  experienced 
  observers 
  to 
  take 
  up 
  its 
  

   systematic 
  investigation. 
  

  

  LXI. 
  The 
  Magnetic 
  Elements 
  at 
  the 
  Cape 
  of 
  Good 
  Hope 
  

   from 
  1605 
  to 
  1900. 
  By 
  J. 
  G. 
  Beattie, 
  D.Sc, 
  and 
  J. 
  T. 
  

   'Morrison, 
  M.A., 
  B.Sc* 
  

  

  T 
  

  

  Cape 
  was 
  made 
  in 
  1605, 
  the 
  first 
  measurement 
  of 
  

   intensity 
  about 
  1841, 
  the 
  first 
  observation 
  of 
  inclination 
  or 
  dip 
  in 
  

   1751. 
  Other 
  observations 
  have 
  been 
  made 
  at 
  irregular 
  intervals 
  

   till 
  1840. 
  In 
  1841 
  a 
  detachment 
  of 
  R.A. 
  began 
  observations 
  

   at 
  the 
  Royal 
  Observatory, 
  Capetown, 
  and 
  carried 
  them 
  on 
  till 
  

   1846. 
  This 
  observational 
  work 
  was 
  continued 
  at 
  the 
  per- 
  

   manent 
  magnetical 
  observatory 
  established 
  in 
  connexion 
  

   with 
  the 
  Royal 
  Observatory 
  of 
  the 
  Cape 
  of 
  Good 
  Hope 
  ; 
  

   the 
  magnetic 
  work 
  seems 
  to 
  have 
  been 
  discontinued 
  after 
  

   1869. 
  

  

  In 
  recent 
  years 
  observations 
  have 
  been 
  taken 
  by 
  the 
  mag- 
  

   netic 
  observers 
  attached 
  to 
  various 
  expeditions. 
  In 
  addition 
  

   to 
  these, 
  yearly 
  observations 
  are 
  taken 
  at 
  the 
  Royal 
  Obser- 
  

   vatory, 
  Capetown, 
  by 
  Messrs. 
  Beattie 
  and 
  Morrison 
  with 
  

   a 
  set 
  of 
  field-instruments 
  (Kew 
  pattern) 
  obtained 
  by 
  Sir 
  

   David 
  Gill 
  in 
  1894. 
  

  

  § 
  2. 
  Inclination. 
  

  

  The 
  following 
  is 
  a 
  list 
  of 
  the 
  determinations 
  of 
  inclination 
  

   sit 
  the 
  Cape. 
  

  

  * 
  Communicated 
  by 
  the 
  Authors. 
  Abstract 
  of 
  paper 
  communicated 
  to 
  

   the 
  South 
  African 
  Philosophical 
  Society 
  in 
  1901. 
  

  

  