Page:Collected Physical Papers.djvu/12

page structures—Action of paper disc—Ring systems in woody stems—Production of dark cross by wood and stalactite •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •

111

(Proc. Roy. Soc. March, 1898.)

XII

ON A SELF-RECOVERING COHERER AND THE STUDY OF COHERING ACTION OF DIFFERENT METALS

Response of Potassium receiver by increase of electric resistance followed by automatic recovery—Response of Sodium and Lithium—Response of metals of alkaline earth—Magnesium, Zinc, and Cadmium—Bismuth and Antimony—Iron and allied metals—Tin, Lead and Thallium—Molybdenum and Uranium—Metals of Platinum group—Copper, Gold and Silver—Untenability of the theory of coherence •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •

116

XIII

ON ELECTRIC TOUCH AND THE MOLECULAR CHANGES PRODUCED IN MATTER BY ELECTRIC WAVES

Action of ether-waves in modification of molecular structure—Positive and negative responses exhibited by two different classes of substance—Non-discriminative mass action and discriminative molecular action—Change of sign of response under sub-minimal stimulation—Opposite responses under feeble and moderate stimulations in Arsenic and Osmium receivers—Molecular change induced by electric radiation—Allotropic modification under visible radiation—Allotropic changes attended by variation of electric conductivity—The radiation product—Two varieties of Silver—Electrical reversal—Radio-molecular oscillation—Positive and negative variation of conductivity in two different classes of fatigued substances—Restoration of original conductivity by heat and by mechanical vibration •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •          •

127

(Proc. Roy. Soc. February, 1900.)

XIV

ON THE CONTINUITY OF EFFECT OF LIGHT AND ELECTRIC RADIATION ON MATTER

Conductivity variation induced by electric radiation—Modification of response by (a) previous history (b) by change of temperature and (c) by increased pressure of contact—Recording Apparatus for Conductivity and for Electromotive variation—Transition of a Molecular Receiver from Non-recovering to Self-recovering condition—Self-recovering and metrical receivers of positive and negative types—Phosphorescence and Thermo-luminescence—Maximum effect under continuous radiation—Relation between intensity of