BERENICE LAURA TOWERS

WHOSE ENCOURAGEMENT AND ASSISTANCE

WERE CONSTANT IN THE GATHERING

AND PREPARATION OF MATERIAL

FOR THIS VOLUME.




CONTENTS


CHAP.

PREFACE

I. COMMUNICATION AMONG THE ANCIENTS

II. SIGNALS PAST AND PRESENT

III. FORERUNNERS OF THE TELEGRAPH

IV. INVENTIONS OF SIR CHARLES WHEATSTONE

V. THE ACHIEVEMENT OF MORSE