Masters of Space / Morse and the Telegraph; Thompson and the Cable; Bell and the Telephone; Marconi and the Wireless Telegraph; Carty and the Wireless Telephone

by Walter Kellogg Towers

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