IMPROVEMENTS IN THE CONSTRUCTION OF PROPELERS, AND IN ARRANGEMENTS OF ENGINES FOR WORKING THE SAME FOR PROPULSION OF SHIPS OR VESSELS
Year: 1857

page_text: by the Act.)
PROVISIONAL SPECIFICATION left by Robert James Maryón at the
Office of the Commissioners of Patents, with his Petition, on the
20th July 1857.
I, ROBERT JAMES MARYÓN, Mechanician, of No. 40, Hooper Street, West-
minster Road, Lambeth, in the County of Surrey, do hereby declare the nature
of the said Invention for "IMPROVEMENTS IN THE CONSTRUCTION OF PROPELERS,
AND IN ARRANGEMENTS OF ENGINES FOR WORKING THE SAME FOR PROPULSION OF
SHIPS OR VESSELS," to be as follows:-
My Invention consists of an improved method of propulsion by my double
trunk propelers, consisting of one or two of my double trunks for aft propelers,
(or a greater number of them in extreme cases, as for instance, in outsised
ships), and also two of my double trunks I arrange diagonally for backward
action, one on each side of the kelson, in any most suitable line of action,
which I work by eccentric lever or crank motion, clutched in gear with the
main shaft, or connected by short end shafts (either worked together by a cross
head; or by alternate up-and-down stroke striking the water at opposite time);
my fore-and-aft double trunks I work either in a centre line of the. vessel in a
slot or aperture formed in the after run approaching the dead wood, where
sufficient breadth of the ship admits of inserting near as possible to her keel
my double trunks; but I prefer the arrangement shewn as applied in my
Drawing of Figure 1, arranged on each side of the run close as possible to

page_text: the run of the ship, in which I form a channel of a section of a circlo, which
is lost by the gradual incline of the dead wood to nothing, and therefore will
not affect the ship when under sail; in this said channel a guide may be
applied for to support the end of my double trunk, let in flush with the run of
the ship and channel; but I think this will not be necessary, except in
instances of very long stroke propelers, as, my double trunks will be rigid
enoughf without a guide, as it will work with less friction. (A is my Invention
in Fig. 1, marked on the starboard 'and port double trunks; (which may be
formed of cast or of wrought metal, or inetals anti-corrosive, or of wrought
plate iron riveted togethe, flush or lap-welded, for strength and lightness,
cased with gun metal or anti-corrosive metals, by casting the sane over the
outside surface,.or otherwise fitted thereon, and turned to fit their cylinders
through which they work; but if of. entire cast metal, it will be necessary to
give greater thickness of metal at the centre of their length, in order that they
inay be rigid to withstand the thrust of the engine). B, the usual piston rod;
C, the guide bed of d.; d, the boss or guide block, which may be disconnected
by a hand lever or screw by withdrawing the key; e is my arrangement of
wood chock, built in and caulked with my chamber cylinders, which may be
cast together or separate,, as shown, and are gasket or with other compressible
packing packed as far through as necessary to reduce the friction of my double
trunks; F is the centre line fore-and-aft chock, continued on to the dead
wood or solid portion of iron or wooden vessels as heretofore built; G, starting
stage; H, H, the cylinders; I, the air pump, arranged below or in the front,
worked by the cross head,' or off the piston rod. Fig. 1 in detail is lettered
the same, shewing elevation; Fig. 2 shews my double trunk propelers
arranged for backing astern. I, the eccentric, clutched; K, the main shaft;
L; my double trunks, shewn applied on the port side of the kelson;' (as this
arrangement of engine occupies great length of engine room, where that may
be a consideration for small vessels, I apply and 'arrange, precisely in the same
manner as my Drawing, working by direct action of the piston, the well-known
single-trunk engines, which will admit of working the crank close to the
cylinder covers; but as this class of engine requires a greater space between
my double-trunk propellers it would not be found so good, as the closer they
can be worked the steadier the ship will advance through the water; and
therefore to provide for the room occupied by my arrangement, shewn .iñ
Drawing of Fig. 1, arched coal bunks may be built over the engine foom, at
such suitable positions extending downwards to, the engine room flooring to
occupy the curved side space of the vessel, thus leaving a arched tunnel space
for the engines working, and a hat roof or deck flooring for cargo, which

page_text: should be constructed of iron. The main advantage of this my Invention
consists in employing the steam power without loss, as every stroke of the
piston must do its duty by direct force at my propelers, which cannot slip or
lose by reason of its great depth in the water and position, having the broad
bearings of the vessel above it, compressing or rather keeping the water from
uprising whilo propelling to the greatest possible extent; as for instance, if
the water does not uprise, the vessel must advance the entire length of stroke
of my propeler, and thus obtain more speed with slower working engines,
thereby reducing wear and tear, and avoid melting the bearings by excessive
friction, which hitherto occurs, as also breakdowns of the engine, owing to the
old screw being out or partly so of the water when the vessel is piching in
heavy seas, thereby causing unequal motion of the engines, as also loss of speed
and of power.
I wish therefore it be plainly understood, that my Invention consists of my
double-trunk propelers, and as applied or arranged to the run of the vessel,
shewn in my Drawings, and the arrangements of steam engines for driving the
same by direct force from the piston, with all modifications of the same.