3. Lift is directly proportional to purity.
AIRSHIP DESIGN
The design of airships has been developed under three distinct
types, the Rigid, the Semi-Rigid, and the Non-Rigid.
The rigid, of which the German Zeppelin is the leading example,
consists of a framework, or hull composed of aluminium, wood,
or other materials from which are suspended the cars, machinery
and other weights, and which of itself is sufficiently strong to
support its own weight. Enclosed within this structure are a
number of gas chambers or bags filled with hydrogen, which
provide the necessary buoyancy. The hull is completely encased
within a fabric outer cover to protect the hull framework and
bags from the effects of weather, and also to temper the rays of
the sun.
The semi-rigid, which has been exploited principally by the
Italians with their Forlanini airships, and in France by Lebaudy,
has an envelope, in some cases divided into separate
compartments, to which is attached close underneath a long girder
or keel. This supports the car and other weights and prevents
the whole ship from buckling in the event of losing gas. The
semi-rigid type has been practically undeveloped in this country.
The non-rigid, of which we may now claim to be the leading
builders, is of many varieties, and has been developed in several
countries.
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