Front matter
Reading edition
THE Practical Science Series
The following Vols. are now ready or in the Press:—
BALLOONS, AIRSHIPS, AND FLYING MACHINES. By Gertrude Bacon.
MOTORS AND MOTORING. By Professor Harry Spooner.
RADIUM. By Dr. Hampson.
METEOROLOGY; or, Weather Explained. By J. Gordon M‘Pherson, M.A., LL.D.
Others in Preparation
The Authoress, her Father, and Mr. Spencer making an Ascent.
Frontispiece.
BALLOONS AIRSHIPS AND FLYING MACHINES
BY GERTRUDE BACON
NEW YORK DODD, MEAD & COMPANY LONDON: T. C. & E. C. JACK 1905