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AN

ESSAY

ON THE

STRENGTH AND STRESS OF TIMBER,

FOUNDED UPON

EXPERIMENTS

PERFORMED AT THE

ROYAL MILITARY ACADEMY,

ON SPECIMENS SELECTED FROM THE ROYAL ARSENAL, AND
HIS MAJESTY'S DOCK-YARD, WOOLWICH:

PRECEDED BY

AN HISTORICAL REVIEW

OF FORMER

THEORIES AND EXPERIMENTS;

WITH

NUMEROUS TABLES AND PLATES.

ALSO

AN APPENDIX,

ON THE

STRENGTH OF IRON, AND OTHER MATERIALS.

BY PETER BARLOW, F.R.S.

OF THE ROYAL MILITARY ACADEMY;

HONORARY MEMBER OF THE CAMBRIDGE PHILOSOPHICAL SOCIETY,
OF THE SOCIETY OF CIVIL ENGINEERS, ETC. ETC.

THIRD EDITION, CORRECTED.

LONDON:

PRINTED FOR J. TAYLOR, AT THE ARCHITECTURAL LIBRARY,

No. 59, HIGH HOLBORN.

1826.

London: Printed at the Temple Printing-office,

BY J. MOYES, BOUVERIE STREET.

ΤΟ

TA420 34

1826

THE RIGHT HONOURABLE

EARL MULGRAVE,

MASTER-GENERAL OF THE ORDNANCE,

ETC. ETC. ETC.

MY LORD,

It was with your permission that I first engaged in the Experiments which have laid the foundation of the following Essay; and with your approbation that I prepared them for the press. Permit me then, my Lord, in submitting my labours to the Public, to acknowledge the obligation I am under for your Lordship's support and encouragement; and to express the sentiments of respect with which

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PREFACE.

TA 420

34

1826

A CORRECT knowledge of the Strength and Stress of Timber, and other materials, is admitted to be of the highest value to every one concerned in mechanical and architectural constructions and yet it is generally allowed to be a part of those arts less understood than any other; and in which, therefore, the greatest errors are frequently committed.

"This subject," says Dr. Robison,* "is of so much importance, that in a nation so eminent for invention and ingenuity in every species of manufactory, and in particular so distinguished for its improvements in machinery of every kind, it is singular that no writer has treated of it in the detail which its difficulty and importance demand.

"The man of science who visits our great manufactories is delighted with the ingenuity which he observes in every part; the innumerable inventions which come even from the individual artisans, and the determined purpose of improvement and refinement which he sees in every workshop: every cotton-mill appears an academy of mechanical science; and mechanical invention is spreading from these fountains over the whole kingdom.

"But the philosopher is mortified to see this ardent spirit so cramped by ignorance of principles; and many of these

* Encyclopædia Britannica, Art. STRENGTH.

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