and space to see all that is required. In the forward portion of
the car are disposed all the controls and navigating instruments,
together with engine-telegraphs and voice pipes. Aft is the
wireless telegraphy cabin and sleeping accommodation for the
crew.

A complete electrical installation is carried of two dynamos and
batteries for lights, signalling lamps, telephones, etc. The
engines are mounted in a power unit structure separate from the
car and reached by a wooden gangway supported by wire cables.
This structure consists of two V-shaped frameworks connected by a
central frame and by an under-structure to which floats are
attached. The mechanics' compartment is built upon the central
frame, and the engine controls are operated from this cabin.

In the original power units two 250 horse-power Rolls Royce
engines were fitted, driving propellers on independent shafts
through an elaborate system of transmission. This proved to be a
great source of weakness, as continual trouble was experienced
with this method, and a fracture sooner or later occurred at the
universal joint nearest to the propeller. When the modified form
of ship was built the whole system of transmission was changed,
and the propellers were fitted directly on to the engine
crankshafts.

At a later date 240 horse-power Fiat engines were installed, and
the engineers' cabin was modified and an auxiliary blower was
fitted to supply air to the ballonets for use if the engines are
not running.