  CHAPTER I THE MIRACLE OF RADIUM Story of the Marvels and CHAPTER II FLYING MACHINES [1] Santos-Dumont's Steerable Balloons CHAPTER III THE EARTHQUAKE MEASURER Professor John Milne's Seismograph CHAPTER IV ELECTRICAL FURNACES How the Hottest Heat is Produced Making Diamonds CHAPTER V HARNESSING THE SUN The Solar Motor CHAPTER VI THE INVENTOR AND THE FOOD PROBLEM Fixing of Nitrogen Experiments of Professor Nobbe CHAPTER VII MARCONI AND HIS GREAT ACHIEVEMENTS New Experiments in Wireless Telegraphy CHAPTER VIII SEA-BUILDERS The Story of Lighthouse CHAPTER IX THE NEWEST ELECTRIC LIGHT Peter Cooper Hewitt and BOYS' SECOND BOOK OF BOYS' SECOND BOOK |
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