IV. THE MILITARY DIRIGIBLE
V. BRITISH AIRSHIP DESIGN
VI. THE AIRSHIP COMMERCIALLY
VII. KITE BALLOONS

PART IV--ENGINE DEVELOPMENT
I. THE VERTICAL TYPE
II. THE VEE TYPE
III. THE RADIAL TYPE
IV. THE ROTARY TYPE
V. THE HORIZONTALLY-OPPOSED ENGINE
VI. THE TWO-STROKE CYCLE ENGINE
VII. ENGINES OF THE WAR PERIOD

APPENDICES



PART I

THE EVOLUTION OF THE AEROPLANE

I. THE PERIOD OF LEGEND

The blending of fact and fancy which men call legend reached its
fullest and richest expression in the golden age of Greece, and
thus it is to Greek mythology that one must turn for the best
form of any legend which foreshadows history. Yet the
prevalence of legends regarding flight, existing in the records
of practically every race, shows that this form of transit was a