BOYS' SECOND BOOK OF 
INVENTIONS
 
BOYS' SECOND BOOK 
OF INVENTIONS
BY RAY STANNARD BAKER
Author of
Boys' Book of Inventions, Seen in
Germany
FULLY ILLUSTRATED
NEW YORK
DOUBLEDAY, PAGE & COMPANY
MCMIX
 Copyright, 1903, by
McCLURE, PHILLIPS & CO.
Published, November, 1903, N
TABLE OF CONTENTS 
CHAPTER I
PAGE
The Miracle of Radium3
  Story of the Marvels and Dangers of the New Element
      Discovered by Professor and Madame Curie.
CHAPTER II
Flying Machines27
 Santos-Dumont's Steerable Balloons.
CHAPTER III
The Earthquake Measurer79
 Professor John Milne's Seismograph.
CHAPTER IV
Electrical Furnaces113
 How the Hottest Heat is Produced—Making Diamonds.
CHAPTER V
Harnessing the Sun153
 The Solar Motor.
CHAPTER VI     
The Inventor and the Food Problem173
 Fixing of Nitrogen—Experiments of Professor Nobbe.
CHAPTER VII
Marconi and his Great Achievements207
 New Experiments in Wireless Telegraphy.
CHAPTER VIII
Sea-Builders255
 The Story of Lighthouse Building—Stone-Tower Lighthouses,
                              
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