only.

These valves are all very similar in design. They consist of two
wooden rings, between which the envelope is gripped, and which
are secured to each other by studs and butterfly nuts. The valve
disc, or moving portion of the valve, is made of aluminium and
takes a seating on a thin india rubber ring stretched between a
metal rod bent into a circle of smaller diameter than the valve
opening and the wooden ring of the valve. When it passes over
the wooden ring it is in contact with the envelope fabric and
makes the junction gastight. The disc is held against the rubber
by a compressed spring.

The valve cords are led to the pilot's seat through eyes attached
to the envelope.

The system of rigging or car suspension is simplicity itself and
is tangential to the envelope. On either side there are six main
suspensions of 25 cwt. stranded steel cable known as "C"
suspensions. Each "C" cable branches into two halves known as
the "B" bridles, which in turn are supported at each end by the
bridles known as "A." The ends of the "A" bridles are attached
to the envelope by means of Eta patches. These consist of a
metal D-shaped fitting round which the rigging is spliced and
through which a number of webbing bands are passed which
are spread out fanwise and solutioned to the envelope. It will
thus be seen that the total load on each main suspension is
proportionally taken up by each of the four "A" bridles, and that
the whole weight of the car is equally distributed over the
greater part of the length of the envelope. Four handling guys