: Lightning Thunder and Lightning Conductors by Molloy Gerald - Lightning; Lightning conductors; Thunderstorms

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LIGHTNING AND THUNDER.

Identity of Lightning and Electricity--Franklin's Experiment--Fatal Experiment of Richman--Immediate Cause of Lightning--Illustration from Electric Spark--What a Flash of Lightning Is--Duration of a Flash of Lightning--Experiments of Professor Rood--Wheatstone's Experiments--Experiment with Rotating Disc--Brightness of a Flash of Lightning--Various Forms of Lightning--Forked Lightning, Sheet Lightning, Globe Lightning--St. Elmo's Fire--Experimental Illustration--Origin of Lightning--Length of a Flash of Lightning--Physical Cause of Thunder--Rolling of Thunder--Succession of Peals--Variation of Intensity--Distance of a Flash of Lightning

LIGHTNING CONDUCTORS.

RECENT CONTROVERSY ON LIGHTNING CONDUCTORS.

Theory of Lightning Conductors Challenged--Lectures of Professor Lodge--Short Account of his Views and Arguments--Effect of Self-Induction on a Lightning Rod--Experiment on the Discharge of a Leyden Jar--Outer Shell only of a Lightning Rod Acts as a Conductor--Discussion at the Meeting of the British Association, September, 1888--Statement by Mr. Preece--Lord Rayleigh and Sir William Thomson--Professor Rowland and Professor Forbes--M. de Fonvielle, Sir James Douglass, and Mr. Symons--Reply of Professor Lodge--Concluding Remarks of Professor Fitzgerald, President of the Section--Summary Showing the Present State of the Question

PAGE

THE ELECTRIC SPARK: A TYPE OF A FLASH OF LIGHTNING, 8

CARDBOARD DISC WITH BLACK AND WHITE SECTORS; AS SEEN WHEN AT REST, 12

SAME DISC; AS SEEN WHEN IN RAPID ROTATION, 12

THE BRUSH DISCHARGE, ILLUSTRATING ST. ELMO'S FIRE, 17

ORIGIN OF SUCCESSIVE PEALS OF THUNDER, 22

VARIATIONS OF INTENSITY IN A PEAL OF THUNDER, 24

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