THE FORCE OF

THE WIND

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THE PROBLEM OF FLIGHT By HERBERT CHATLEY, B.Sc. (Eng.), London. Professor of Civil Engineering Tong Shan Engineering College, N. China. CONTENTS-The Problem of Flight-The Helix-The Aëroplane-The Aviplane-Dirigible Balloons-Form and Fittings of the Airship-APPENDICES (The possibility of Flight, Weight, A Flexible Wing, Theory of Balance, Bibliography)-INDEX.

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STRESSES IN MASONRY

By HERBERT CHATLEY, B.Sc. (Eng.), London. Professor of Civil Engineering Tong Shan Engineering College, N. China. CONTENTS-Strength of Stave-Walls-Columns and Piers-Brackets and Cantilevers-Simple Arches-Vaults and Skew Arches-Domes-Retaining Walls and Dams-Artificial Stone-Reinforced Concrete.

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MARINE METEOROLOGY

By WILLIAM ALLINGHAM.

CONTENTS.-Introductory-Instruments Used at Sea for Meteorological Purposes-Meteorological Log-Books-Atmospheric Pressure-Air Temperatures-Sea Temperatures-Winds-Wind Force Scales-History of the Law of Storms-Hurricanes, Seasons, and Storm Tracts-Solution of the Cyclone Problem-Ocean Currents-Icebergs-Synchronous Charts -Dew, Mists, Fogs and Haze-Clouds-Rain, Snow, and Hail-Mirage, Rainbows, Coronas, Halos and Meteors-Lightning, Corposants, and Auroras-QUESTIONS-APPENDIX-INDEX.

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Fourth Edition, Revised, with Numerous Diagrams, Examples and
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THE DESIGN OF STRUCTURES

A Practical Treatise on the Building of Bridges, Roofs, &c.
By S. ANGLIN, C.E.

Master of Engineering, Royal University of Ireland,

late Whitworth Scholar, &c.

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A PRACTICAL TREATISE ON

BRIDGE CONSTRUCTION

By T. CLAXTON FIDLER, M. Inst.C.E.
Prof. of Engineering, University College, Dundee.

"Sound, simple and full."-The Engineer.

LONDON: CHARLES GRIFFIN & CO., Ltd., EXETER ST., STRAND.

THE WIND

06

BY

HERBERT CHATLEY

B.Sc. (ENGINEERING)

MEMBER OF THE AERONAUTICAL SOCIETY OF GREAT BRITAIN
MEMBER OF THE ROYAL SOCIETY OF ARTS, ETC.

PROFESSOR OF CIVIL ENGINEERING, TONG

SHAN ENGINEERING COLLEGE, N. CHINA

AUTHOR OF

HOW TO USE WATER POWER,' "THE PROBLEM OF FLIGHT
"HOW TO DESIGN IN STEEL," "CRAFTSMEN'S CALCULATIONS
AND PART-AUTHOR OF "SURVEYING

LONDON

CHARLES GRIFFIN & COMPANY, LIMITED

EXETER STREET, STRAND

1909

SD

心

PREFACE

In the course of my researches on the subject of aviation I have frequently noticed the absence of any work dealing with the subject of wind pressure in relation to engineering, and I am inclined to think that this little book meets a want that has long been felt by engineers.

The formulæ are as simple in each case as circumstances and moderate accuracy will permit, and calculus methods are only introduced in three places, where it seems almost impossible to avoid them.

I have endeavoured throughout to bring the matter as nearly up to date as possible, and have included the results recently published by Eiffel and Lanchester. By excluding all matters not immediately concerned with wind force or of those which have not yet attained engineering