CONTENTS.

EXAMINATION OF THE TELEGRAPHIC APPARATUS AND THE PROCESSES IN TELEGRAPHY. BY SAMUEL F. B. MORSE, LL.D.

STEAM ENGINEERING AS ILLUSTRATED BY THE PARIS UNIVERSAL · EXPOSITION. BY WILLIAM S. AUCHINCLOSS.

ENGINEERING AND PUBLIC WORKS. BY WILLIAM P. BLAKE.

BÉTON-COIGNET; ITS FABRICATION AND USES, &c. BY LEONARD F. BECKWITH.

ASPHALT AND BITUMEN AS APPLIED IN CONSTRUCTION, &C. BY ARTHUR BECKWITH.

BUILDINGS, BUILDING MATERIALS, AND METHODS OF BUILDING. BY JAMES H. BOWEN.

MINING AND THE MECHANICAL PREPARATION OF ORES. BY HENRY F. Q. D'ALIGNY, AND MESSRS. HUET, GEYLER, AND LEPAINTEUR.

REPORTS OF THE UNITED STATES COMMISSIONERS.

EXAMINATION

OF THE

TELEGRAPHIC APPARATUS

AND THE

PROCESSES IN TELEGRAPHY

BY

SAMUEL F. B. MORSE, LL.D.,

UNITED STATES COMMISSIONER.

WASHINGTON:

GOVERNMENT PRINTING OFFICE.