﻿VI CONTENTS OF VOL. XLIV. SIXTH SERIES. 



Page 

 Dr. F. W. Edridge-Green on Colour- Vision Theories in Relation 



to Colour-Blindness 916 



Mr. A. H. Davis on Natural Convective Cooling in Fluids 920 



Mr. A. II. Davis on the Cooling Power of a Stream of Viscous 



Fluid : 940 



Dr. F. H. Newman on a Sodium-Potassium Vapour Arc Lamp. 



(Plate V.) 944 



Mr. J. J. Mauley on the Protection of Brass Weights 948 



Mr. H. S. Rowell on the Analysis of Damped Vibrations 951 



Mr. F. M. Lidstone on the Full Effect of the Variable Head in 



Viscosity Determinations , 953 



Dr. L. Silberstein and Mr. A. P. II. Trivelli on a Quantum Theory 



of Photographic Exposure. (Second Paper.) ... 956 



Dr. J. S. G. Thomas on the Discharge of Air through Small Orifices, 



and the Entrainment of Air by the .Issuing Jet. (Plate VI.). . . 969 

 Dr. J. R. Partington on the Chemical Constants of some Diatomic 



Gases 988 



Mr. M. F. Skinner on the Motion of Electrons in Carbon Dioxide. . 994 

 Mr. W. N. Bond on a Wide Angle Lens for Cloud Recording. 



(Plate VII.) . . . 999 



The Research Staff of the General Electric Company Ltd., London : 

 A Problem in Viscosity : The thickne-s of liquid films formed on 



solid surfaces under dynamic conditions. (Plate VIII.) 1002 



Prof. S. Timoshenko on the Distribution of Stresses in a Circular 



Ring compressed by Two Forces acting along a Diameter .... 1014 



Prof. A. VV. Porter on a Revised Equation of State 1020 



Prof. V. Ka rape toff : General liquations of a Balanced Alternating- 

 Current Bridge 1024 



Prof. J. S. Towtjsend and Mr. V. A. Bailey on the Motion of Elec- 

 trons in Argon and in Hydrogen 1033 



Prof. S. R. Milner : Does an Accelerated Electron necessarily radiate 



Energy on the Classical Theory ? .\ ..... . 1052. 



Mr. A. Press on a Simple Model to illustrate Elastic Hysteresis . . 1053 



Mr. S, Lees : Note on the above = 1054 



Notices respecting New Books : — 



M. H. Ollivier's Cours de physique generale 1055 



Dr. J. W. Mellor's A Comprehensive Treatise on Inorganic 



and Theoretical Chemistry - 1056 



Mr. S. G. Starling's Science in the Service of Man : Electricity. 1058 

 M. Gustave Mie's La theorie Einsteinienne de la Gravitation. . J 058 

 Wave-lengths in the Arc Spectra of Yttrium, Lanthanum, and 

 Cerium and the preparation of pure Rare Earth Elements. . 1058 



The Journal of Scientific Instruments 1059 



Proceedings of the Geological Society : — 



Mr. R. D. Oldham on the Cause and Character of Earthquakes. 1060 



Sir C. J. Holmes on Leonardo da Vinci as a Geologist 1061 



Intelligence and Miscellaneous Articles: — 



On the Buckling of Deep Beams, by Dr. J. Prescott 1062 



On Damped Vibrations, by Mr. C. E. Wright 1063 



On the Magnetic Properties of the Hydrogen - Palladium 



System, by Mr. A. E. Oxley 1063 



On Short Electric Waves obtained by Valves, by Prof. R. 

 Whiddington 1064 



