[Illustration: Figure 13.--LINES OF _Taurus_. From the Admiralty
Collection of Draughts, National Maritime Museum, Greenwich.]
The sail and rigging plan is likewise a Danish copy and shows the
two-masted lateen rig employed. The hull is shown with bulwarks and
gunports on the spar deck but no other evidence that the _Battery_ was
finished in this manner has been found. The rig resembles that of some
of Josiah Fox's designs for Jeffersonian gunboats--double-enders
designed to sail in either direction but without the jibs. The topmasts
do not appear to be more than signal poles and apparently were not
fitted with sails; however, some European lateeners did have triangular
topsails over a lateen and it is possible the _Battery_ may have carried
such sails. Considering the stability and displacement of the _Battery_,
the rig is very small and not sufficiently effective. Shrouds were not
required; the masts were supported by runners that were shifted when the
yards were reversed, and in tacking. Apparently the jibstays also could
be slacked off so that the lateen yards would not have to be dipped
under them.
[Illustration: Figure 14.--RUDDER DETAIL of _Taurus_. From the Admiralty
Collection of Draughts, National Maritime Museum, Greenwich.]
The inboard profile is on tracing paper and the notes are in French.
This drawing is of a simplified hull form having flat-bottom hulls with
chines. It is possible that this is a tracing of a preliminary drawing
obtained by Marestier or Montgéry, but no documentation can be found.
Its importance is that it shows in some detail the engine and boilers,
as well as the wheelbox, and another drawing of the paddle wheel, more
or less duplicating the wheel shown in the Danish plan. No details of
the deck arrangements are shown in any of the plans, except for the dome
skylight over the fireroom in the boiler hull.
Both the lines plan and the inboard drawing show construction
midsections and hull connections. These plans show that the engine was
not inclined, but rather was vertical, contrary to Fulton's patent
drawing. The piston rod and the crosshead obviously passed through its
gun deck in a large hatch. Also it is plain that there must have been
large hatches afore and abaft the wheelbox to make the stepped wheelbox
construction desirable. There also must have been a hatch in the gun
deck under the domed skylight. It is improbable that the engine and
skylight hatches were used for ladderways, passing scuttles, or
companionways.
The boilers are shown in the inboard profile about as described and
drawn by Marestier but with two stacks on each boiler, one to each flue;
Marestier's sketch in his report on American steamships shows the flues
of each boiler trunked into a single stack. The battery had two boilers
and the stacks are at the boilers' fire-door end. The steam lines came
off the crown of the boilers and probably passed through the ends of the
wheelbox to the engine; a trunk for the steam lines would undoubtedly
have been necessary.
[Illustration: Figure 15.--SKETCH OF 130-GUN SHIP proposed by Patrick
Miller to King Gustav III of Sweden in 1790. In Statens Sjöhistoriska
Museum, Stockholm.]
[Illustration: Figure 16.--PATRICK MILLER'S manually propelled
(paddle-wheel) catamaran ship _Experiment_, built at Leith, Scotland,
1786. Scale drawing in Statens Sjöhistoriska Museum, Stockholm.]
The engine is shown to have had counterbalanced side levers, one on
each side, and a single flywheel on the outboard side. The cylinder is
over the condenser or "cistern," connected by the steam line and valve
box on the side. The cylinder crosshead is shown in the inboard profile
to have reached the underside of the beams of the upper deck. The
crosshead was connected by two connecting rods to the side levers. These
levers operated the paddle wheel by connecting rods to cranks on the
paddle-wheel shaft. There is another pair of connecting rods from the
side levers to the crosshead of the air pump. All connecting rods are on
one arm of the side levers, the other end having only a counterbalance
weight beyond the fulcrum bearing. The flywheel has a shaft fitted with
two gears, and is driven through idler gears from gears on the
paddle-wheel shaft; it turns at about twice the speed of the paddle
wheel. No other pumps or fittings are shown in the engine hull, although
manual pumps were probably fitted to fill and empty the boilers. Piping
is not shown.
[Illustration: Figure 17.--PAINTING OF THE _Experiment_ in the Statens
Sjöhistoriska Museum, Stockholm.]
The four rudders, toggled in pairs, are shown in both the lines and
inboard drawings, but the shape is different in the two plans. Operation
must have been by a tiller under the gun-deck beams. The outer end of
the tiller may have been pivoted on the toggle bar and the inboard end
fitted, as previously described, with steering cable or chain tackles.
This seems to be the only practical interpretation of the evidence.