of the keel is
carried out in such a manner as to secure uniformity of weight upon the
gas bag. The propelling power comprises two sets of internal combustion
engines, each developing 130 horse-power, the transmission being through
rubber belting. The propellers, built of wood, make 350 revolutions per
minute, and are set as closely as possible to the centre of resistance.

But the most salient characteristic of this machine is its portability.
It can be dismantled and transported by wagons to any desired spot,
the suspension frame being constructed in units, each of which is
sufficiently small to be accommodated in an ordinary vehicle. Upon
arrival the parts may be put together speedily and easily. The
authorities submitted the airship to exacting trials and were so
impressed by its characteristics and the claims of the inventor that
undoubtedly it will be brought into service during the present crisis.

At the same time the whole faith of the German military staff so far
as airship operations are concerned, is pinned to the Zeppelin.
Notwithstanding its many drawbacks it is the vessel which will be used
for the invasion of Great Britain. Even the harbour question, which is
admitted to be somewhat acute, has been solved to a certain degree.
At strategical points permanent harbours or airship sheds have been
established. Seeing that the airships demand considerable skill in
docking and undocking, and that it is impossible to achieve these
operations against the wind, swinging sheds have been adopted.

On water the practice is to anchor a floating harbour at one end,
leaving the structure to swing round with the wind. But on dry land such
a dock is impossible. Accordingly turntable sheds have been adopted.
The shed is mounted upon a double turn-table, there being two circular
tracks the one near the centre of the shed and the other towards its
extremities. The shed is mounted upon a centre pivot and wheels engaged
with these inner and outer tracks. In this manner the shed may be swung
round to the most favourable point of the compass according to the wind.

In the field, however, such practices are impossible, and the issue
in this connection has been overcome by recourse to what may be termed
portable harbours. They resemble the tents of peripatetic circuses and
travelling exhibitions. There is a network of vertical steel members
which may be set with facility and speed and which are stayed by
means of wire guys. At