secrecy of Ray's bedroom, we
examined the spy's plan of the new submarine, and read his memoranda,
which were in German, but which translated were as follows:

"REPORT BY LEON KARFF, LATE FOREMAN-FITTER AT KIEL DOCKYARD, ON
SUBMARINE 'F 2,' NOW BUILDING IN SHED NO. 4, PORTSMOUTH
DOCKYARD.

"This boat would appear to me to be of about 700 tons
displacement when complete, possibly rather over. She is, as
far as I am able to measure, about 180 feet long with an
extreme beam a little forward of amidships of 20 feet. She is
fitted with three propeller shafts with three small four-bladed
propellers on each. As she is provided with what appear to me
to be some kind of turbine engines, I imagine that the centre
shaft is for going astern only. The propellers on this shaft
seem to be attached in such a way that they could be
'feathered' by suitable gearing on board so as not to retard
the vessel's way when going ahead. The engines of this boat are
of a type which I have never before seen. I imagine that they
are a combination of the new 'gas-producer' engine and the
turbine system, the explosion of the combined gas and air
being split up and passing into the turbine through a number
of different channels simultaneously. This would be a very
economical system if the necessary power can be obtained,
and would be much safer for use below than petrol engines.

"The boat is evidently intended to operate a good deal in an
'awash' position, for there is fairly thick armour-plating over
the greater part of the upper side of the bow, while the fore
end of the superstructure is made of two 6-inch Krupp steel
plates meeting at an acute angle, and so forming a kind of stem
when the boat is moving in this way. The space enclosed between
these two plates is evidently intended to be used as the
conning-tower. Here there are a periscope, steering-wheel,
voice-tubes, and everything necessary for the control of the
vessel. There are two horizontal propellers or fans, which seem
to be driven by electricity derived from an installation of
accumulators, and which are certainly intended to secure
horizontal immersion, so the vessel will not plunge or dive,
but immerse herself horizontally by means of these propellers,
which, by the way, work in vertical shafts running co