원문 (영어)

MARVELS OF MODERN SCIENCE By PAUL SEVERING Edited by THEODORE WATERS 1910 CONTENTS CHAPTER I FLYING MACHINES Early attempts at flight. The Dirigible. Prof. Langley's experiments. The Wright Brothers. Count Zeppelin. Recent aeroplane records. CHAPTER II WIRELESS TELEGRAPHY Primitive signalling. Principles of wireless telegraphy. Ether vibrations. Wireless apparatus. The Marconi system. CHAPTER III RADIUM Experiments of Becquerel. Work of the Curies. Discovery of Radi