different from that in No. 9. The Parseval type of valve with the
pressure cone at the bottom of the bag is omitted, and in the
place of the two top valves in the former ship are a side valve
of the Zeppelin type entirely automatic and a top valve entirely
hand controlled. The side valve is set to blow off at a pressure
of from 3 to 5 millimetres. The outer cover was fitted in the
same manner as in No. 9. Two cars or gondolas, one forward, the
other aft, each carry one engine provided with swivelling
propellers and gears. They are enclosed with sides and a
fireproof roof, and are divided into two compartments, one the
navigating compartment, the other the engine room. The cars are
in all respects very similar to those of No. 9, and are suspended
from the hull in a similar manner. The remaining two engines are
carried in a small streamline car situated amidships, which has
just sufficient room in it for the mechanics to attend to them.
Originally this car was open at the top, but it was found that
the engineers suffered from exposure, and it was afterwards
roofed in.

The engine arrangements in this ship were totally different to
those of No. 9, four 250 horse-power Rolls Royce engines being
installed in the following order. Single engines are fitted in
both the forward and after cars, each driving two swivelling
four-bladed propellers. In the centre car two similar engines
are placed transversely, which drive single fixed propellers
mounted on steel tube outriggers through suitable gearing.

The engines are the standard 12 cylinder V-type Rolls Royce which
will develop over 300 brake horse-power at full throttle opening.