THEIR CONSTRUCTION AND STRENGTH.

A HANDBOOK OF RULES, FORMULÆ, TABLES, &c.,

RELATIVE TO

MATERIAL, SCANTLINGS AND PRESSURES,
SAFETY VALVES, SPRINGS, FITTINGS AND MOUNTINGS,
ETC., ETC.,

FOR THE USE OF

ENGINEERS, SURVEYORS, DRAUGHTSMEN,
BOILER-MAKERS, AND STEAM USERS.

BY

THOMAS W. TRAILL, F. E. R. N.,

MEMBER OF THE INSTITUTION OF CIVIL ENGINEERS,
ENGINEER SURVEYOR-IN-CHIEF TO THE BOARD OF TRADE,
AUTHOR OF "CHAIN CABLES AND CHAINS."

WITH ILLUSTRATIONS,

LONDON:

CHARLES GRIFFIN AND COMPANY.

EXETER STREET, STRAND.

1888.

[All Rights Reserved.]

·T68

18552

PREFACE.

Á BOOK with the title BOILERS may be expected by some to be one in which the subject is treated more fully than it has been dealt with in the following pages; but there are many reasons why the scope of the present work is limited-amongst others, considerations of time and space.

Nevertheless it is hoped that the book will be found of practical service "all round," and helpful, specially, in at least two essential points, viz., in settling the Scantlings for Boilers in process of construction, and in determining the Pressures for those already made. Should the work prove useful in these respects—both of vital importance as regard the safety and efficiency of Boilers-it will have achieved its object.

The Author desires gratefully to acknowledge the able assistance afforded him in the preparation of the Tables by the Computers and Re-computers, who have spared no pains to ensure accuracy in the calculations throughout.

THE CHASE,

CLAPHAM COMMON, S.W.,

December, 1888.