COMPRISING

PLANE TRIGONOMETRY, SURVEYING, AND LEVELLING.

WITH THEIR APPLICATION TO THE CONSTRUCTION OF

COMMON ROADS, RAILWAYS, CANALS, HARBOURS, DOCKS, TUNNELS, AQUEDUCTS, VIADUCTS, PIERS, WATER-WORKS, &c. ALSO,

A TREATISE ON THE IMPROVEMENT OF LAKES,

RIVERS, BOGS, MARSHES, &c. BY DRAINAGE,

EMBANKMENT, CULTIVATION, AND

IRRIGATION.

THE WHOLE BEING DESIGNED FOR THE USE OF ENGINEERING COLLEGES,
PRIVATE SCHOOLS, PRACTICAL ENGINEERS, LAND PROPRIETORS
AND AGENTS, COUNTY SURVEYORS, ETC,

BY JOHN GREGORY, Esq. C.E.

Author of the Philosophy and Practice of Arithmetic, Practical Geometry, Conic Sections,
Mensuration, Astronomy, Use of the Globes, Construction of Maps, &c. &c.
And Resident Director of the College for Civil Engineering,
Mining, and Agriculture in Ireland.

VOL. I.

DUBLIN

SAMUEL J. MACHEN 8 D'OLIER-STREET.

LONDON: LONGMAN AND CO. WHITTAKER AND CO. SIMPKIN, MARSHALL AND CO. WEALE. HOULSTON AND STONEMAN. HAMILTON, ADAMS AND CO. WASHBOURNE. TILT