﻿PLATES. 
  

  

  I. 
  Illustrative 
  of 
  Mr. 
  R. 
  F. 
  Earliart's 
  Paper 
  on 
  Discharge 
  

   from 
  an 
  Electrified 
  Point. 
  

   II. 
  & 
  III. 
  Illustrative 
  of 
  Dr. 
  C. 
  V. 
  Drysdale's 
  Paper 
  on 
  the 
  Plug- 
  

   Perm 
  eameter. 
  

   IV. 
  Illustrative 
  of 
  Dr. 
  C. 
  V. 
  Drysdale's 
  Paper 
  on 
  the 
  Use 
  of 
  

   Shunts 
  and 
  Transformers 
  with 
  Alternate 
  Current 
  Measuring 
  

   Instruments. 
  

   V. 
  Illustrative 
  of 
  Prof. 
  J. 
  Becquerel's 
  Paper 
  on 
  the 
  Dispersion 
  

   of 
  Magnetic 
  Rotatory 
  Power 
  in. 
  the 
  neighbourhood 
  of 
  

   Bands 
  of 
  Absorption 
  in 
  the 
  case 
  of 
  Rare 
  Earths. 
  

   VI. 
  & 
  VII. 
  Illustrative 
  of 
  Mr. 
  E. 
  Haigh's 
  Paper 
  on 
  Orthobaric 
  Volumes 
  

   in 
  relation 
  to 
  Pressure 
  and 
  Temperature. 
  

   VIII. 
  & 
  IX. 
  Illustrative 
  of 
  Mr. 
  L. 
  Vegard's 
  Paper 
  on 
  Osmosis 
  and 
  

   Osmotic 
  Pressue. 
  

   X. 
  & 
  XL 
  Illustrative 
  of 
  Prof. 
  E. 
  Rutherford 
  and 
  Mr. 
  T. 
  Royds's 
  Paper 
  

   on 
  the 
  Spectrum 
  of 
  the 
  Radium 
  Emanation. 
  

   XII. 
  Illustrative 
  of 
  Dr. 
  G. 
  Johnstone 
  Stoney's 
  Paper 
  on 
  

   Telescopic 
  Vision. 
  

   XIII.-XV. 
  Illustrative 
  of 
  Mr. 
  W. 
  Duddell's 
  Paper 
  on 
  Short 
  Spark 
  

   Phenomena. 
  

   XYL-XIX. 
  Illustrative 
  of 
  Mr. 
  B. 
  S. 
  Cohen's 
  Paper 
  on 
  the 
  Production 
  

   of 
  Small 
  Variable 
  Frequency 
  Alternating 
  Currents 
  suitable 
  

   for 
  Telephonic 
  and 
  other 
  Measurements. 
  

   XX. 
  Illustrative 
  of 
  Mr. 
  F. 
  Soddy's 
  Paper 
  on 
  the 
  Production 
  of 
  

   Helium 
  from 
  the 
  Primary 
  Radio-Elements. 
  

   XXI. 
  Illustrative 
  of 
  Prof. 
  D. 
  N. 
  Mallik's 
  Paper 
  on 
  the 
  Magnetic 
  

   Rotation 
  of 
  Electric 
  Discharge. 
  

   XXII. 
  & 
  XXIII. 
  Illustrative 
  of 
  Dr. 
  C. 
  V. 
  Drysdale's 
  Paper 
  on 
  a 
  Vacuum- 
  

   Tube 
  Model 
  for 
  Demonstrating 
  the 
  Propagation 
  of 
  Alter- 
  

   nate 
  Currents 
  in 
  Cables. 
  

   XXIV. 
  Illustrative 
  of 
  Prof. 
  C. 
  A. 
  Skinner 
  and 
  Mr. 
  A. 
  Q. 
  Tool's 
  

   Paper 
  on 
  the 
  Optical 
  Properties 
  of 
  Films 
  of 
  Magnetic 
  

   Metals. 
  

   XXV. 
  Illustrative 
  of 
  Mr. 
  B. 
  W. 
  Clack's 
  Paper 
  on 
  the 
  Coefficient 
  

  

  of 
  Diffusion. 
  

   XXVI. 
  Illustrative 
  of 
  Messrs. 
  T. 
  H. 
  Laby 
  and 
  G. 
  W. 
  C. 
  Kaye's 
  

   Paper 
  on 
  Gaseous 
  Ionization 
  and 
  Pressure. 
  

   XXVII. 
  Illustrative 
  of 
  Mr. 
  J. 
  J. 
  Taudiu 
  Chabot's 
  Paper 
  on 
  a 
  Rotating 
  

  

  Earth-inductor 
  without 
  Sliding 
  Contacts. 
  

   XXVIII. 
  Illustrative 
  of 
  Prof. 
  R. 
  W. 
  Wood's 
  Paper 
  on 
  an 
  Extension 
  

   of 
  the 
  principal 
  Series 
  of 
  the 
  Sodium 
  Spectrum. 
  

  

  