e Admiralty might care to name.

"After he reached England we shortly received a
cablegram ordering five hundred additional
'Sutphens,' our code word for submarine 'Chaser';
in other words we were now asked to build five
hundred and fifty of these boats and deliver them
in complete running order by November 15th, 1915."

[Illustration: FIG. 2.--Plan of armed motor launch, showing internal
arrangements. _A._ Officers' sleeping cabin. _B.B._ Bunks. _C._
Cupboard. _D._ Lavatory. _E.E._ Stern petrol tanks. _F._ Wardroom. _G._
Table. _H._ Settee. _I._ Galley. _J._ Petrol stove. _K._ Engine-room.
_L.L._ Main engines. _M._ Compressed air reservoirs. _N._ Auxiliary
petrol engine driving dynamo, bilge pumps, fire pumps and air
compressor. _O._ Electric storage batteries, switchboard and electrical
starting arrangements for auxiliary engine. _P._ Chart-room with petrol
tanks below. _Q._ Magazine. _R._ Fresh-water tanks. _S._ Forecastle.
_T._ Bunks for crew. _U._ Forecastle lavatory. _V._ Watertight
forepeak.]

The armament of a motor launch consisted of a 13-pounder quick-firing
high-angle gun, capable of throwing a lyddite shell for over four miles,
and was as useful against aircraft as it was against submarines. In
addition to this heavy gun for small craft they carried about 1200 lb.
of high explosive in the form of depth charges for bombing under-water
craft, a Lewis machine gun, rifles and revolvers.

These vessels were driven by twin screws connected to twin engines of
about 500 h.p. They possessed, in addition, an auxiliary petrol engine
of about 60 h.p. for compressing the air required to start the main
engines, for working the fire and bilge pumps, and for driving a dynamo
to recharge the electric storage batteries. The triple tanks carried
over 3000 gallons of petrol, and the consumption, when travelling at
full speed, was a gallon a minute.

Many were fitted with wireless, and all of them had on board the most
approved pattern of hydrophone, with which to listen below the surface
for the movements of hostile submarines. They had electric light in the
cabins and for navigation, fighting and mast-head signalling purposes. A
moderately powerful searchlight, fitted with a Morse signalling shutter,
was also part of their equipment.

These little miniature warships possessed a small wardroom and sleeping
cabin for the officers, a galley with petrol range for