GAS AND BALLAST.--Buoyancy in Air.--Ascending and
Descending.--The Ballonet.--The Equilibrator 57
DIRIGIBLE BALLOONS AND OTHER KINDS.--Shapes.--
Dimensions.--Fabrics.--Framing.--Keeping the Keel
Horizontal.--Stability.--Rudders and Planes.--Arrangement
and Accessories.--Amateur Dirigibles.--The Fort
Omaha Plant.--Balloon Progress 71
THE QUESTION OF POWER.--Resistance of Aeroplanes.--
Resistance of Dirigibles.--Independent Speed and
Time-Table.--The Cost of Speed.--The Propeller 101
GETTING UP AND DOWN; MODELS AND GLIDERS;
AEROPLANE DETAILS.--Launching.--Descending.--
Gliders.--Models.--Balancing.--Weights.--
Miscellaneous.--Things to Look After 121