IMPROVEMENTS IN STEAM ENGINES AND IN THE MACHINERY FOR PROPELLING VESSELS
Year: 1849

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JEAN
BAPTISTE FRANÇOIS MAZELINE, ainé, of Havre, in the Republic of France,
Engineer, send greeting.
WHEREAS Her present most Excellent Majesty Queen Victoria, by Her
Royal Letters Patent under the Great Seal of the United Kingdom of Great
Britain and Ireland, bearing date at Westminster, the Sixteenth day of
January, One thousand eight hundred and forty-nine, in the twelfth year of
Her reign, did, for Herself, Her heirs and successors, give and grant unto
me, the said Jean Baptiste François Mazeline, ainé, my exors, adññiors, and
assigns, Her especial licence, full power, sole privilege and authority, that I,
tho said Jean Baptiste François Mazeline, aimé, my exors, adñiors, and
assigns, or such others as I, the said Jean Baptiste François Mazeline, ainé,
my exors, adñiors, or assigns, should at any time agree with, and no others,
from time to time and at all times during the term of years therein expressed,
should and lawfully might make, use, exercise, and vend, within England,
Wales, and the Town of Berwick-upon-Tweed, my Invention of "IMPROVEMENTS
IN STEAM ENGINES AND IN THE MACHINERY FOR PROPELLING VESSELS," in which
said Letters Patent is contained a proviso that I, the said Jean Baptiste
François Mazeline, ainé, shall cause a particular description of the nature
of my said Invention, and in what manner the same is to be performed,
by an instrument under my hand and seal, to be inrolled in Her said
Majesty's High Court of Chancery within six calendar months next and
immediately after the date of the said in part recited Letters Patent, as in
and by the same, reference being thereunto had, will more fully and at large
appear.

page_text: NOW KNOW YE, that in compliance with the said proviso, I, the said
Jean Baptiste François Mazeline, ainé, do hereby declare the nature of the
said Invention; and the manner in which the same is to be performed, are
fully described and ascertained in and by the following statement thereof,
reference being had to the Drawings hereunto annexed, and to the figures
and letters marked thereon, that is to say :-
My Invention consists of two parts. The first part consists of an improved
slide valve, which I will call an equilibrium sliding valve, and which is
applicable to any form of steam engines where sliding valves are or may be
used, the principal feature of which is, the reducing or diminishing the pres-
sure and friction, which in ordinary.sliding valves is very considerable. It is
well known, that the ordinary valve slides on one surface provided with two
steam ports and one eduction passage, whereas the principle of my valves is
such, that they slide on or between two surfaces, and each surface being
provided with two steam ports and one eduction passage, and such ports and
passage standing in opposite direction to each other, the pressure on the valves
covering such ports and passages will counterbalance each other, or nearly
so, and thereby diminish the pressure and friction of the valves when they
are moved.
The second part consists in the combinations of two steam cylinders placed
end to end, for the purpose of transmitting the power of the engines to a
stern propeller shaft by two main shafts, as hereafter explained.
DESCRIPTION OF THE DRAWINGS:
FIRST PART; or EQUILIBRIUM SLIDE VALVE.
Drawing No. 1, Figure 1, is a longitudinal section of a steam cylinder,
supposed to be the cylinder of a locomotive engine, to which the equilibrium
valve is applied. Figure 2 is a horizontal section taken through the valve
at the line A, B; and Figure 3 is a cross section of the cylinder and valves.
In each of those Figures, C is the valve box, and V the valve, which may
be said to assume the form of the letter V truncated, when shewn in the
cross section, and which valve slides against two plain surfaces in the valve
box, the surfaces standing at a slight inclination to each other when viewed in
cross section, in order to ensure the valve fitting steam tight against the two
surfaces. D, D, and D¹, D¹, are the induction passages for the steam, all
being of equal dimensions, and placed in opposite directions to each other,
so that when the valve is in the position shewn in the Drawing the steam
will enter through D' and D' at the same time, and will pass into the cylinder
by the channels D formed in the valve box, which discharge the steam into

page_text: the ordinary steam passages E' of the steam cylinder, or by means of two
smaller channels leading to the end of the cylinder, and cast together with the
valve box on the cylinder itself; and when the position of the valve is reversed,
the same operation will take place by the passage of the steam through D,'D,
into E. F and F are the eduction passages. G'is a wedge fitted in the
lower part of the valve box, and on which, the valve slides. H is a screw.
fitted to the wedge G, by which the valve may be adjusted to the surfaces,
and whereby the valve is supported and kept steam-tight. K and 'K' are
orifices in the lower part of the valve box, for the purpose of facilitating the
escape of prime water from the cylinder, when, if occasion shall require, in
such case the wedge G covering the orifices K will be lifted up by the water
in the same manner as in an ordinary valve. L'is the steam pipe or passage
communicating with the steam chamber M on the valve box. Figure 4 is
a longitudinal section of a steam cylinder, to which two equilibrium valves
are applied, and so arranged that each valve being fitted directly over à steam
passage at the end of the cylinder, the steam passes directly into the cylinder
instead of passing into and through the steam passages E and E', which "are
thereby dispensed with, and in this arrangement there is a link connecting
the two valves together, indicated by the letter N. Figure 5 is a horizontal
section of the same combination taken through the valve at the line A, B ;
and Figure 6 is a cross section of the same taken through the steam passage
D. Figure 7 is a horizontal section of an oscilating cylinder, shewing two of
the equilibrium valves as applied to marine engines, one valve being placed
on each side of the trunnions. Figure 8 is a vertical section of the same,
taken through the line A, B, of the valve; and Figure 9 is another vertical
section taken through the line O, P, of the valve box, and partly through the
cylinder, the valve being precisely similar. The same letters of reference are
used as in the former Figures.
:
SECOND, PART; or STEAM ENGINES FOR STERN PROPELLERS.
Drawing No. 2, Figure 10, is a longitudinal section of a horizontal engine,
and Figure 11 is the elevation of another similar engine. Drawing No. 3,
Figure 12, is a horizontal section, and Figure 13 a plan of the same.
Figure 14 is a cross section through one of the cylinders and air pumps.
Figure 15 is an end view of the same. In those Figures, A and A¹
are two steam cylinders, which may either be bolted or placed with their
cylinders ends together, or the two cylinders may be cast in one piece, with
a separation or partition in the middle. B and B are the main shafts;

page_text: C and C are two piston rods fitted to each of the cylinders, and placed
diagonally, so that when the piston rod C passes under the main shaft, the
piston rod C will pass above the main shafts.-Reference to Figure 10
and 12-D is a cross shaft, having at each end a sliding block fitted into
guides at the end of the machine frames. E is a short arm, fixed to the shaft,
projecting upwards, and fitted to the piston rod C'; and F is another short
arm, fixed to the shaft D, projecting downwards, and fitted to the piston rod C;
the combination of these two arms with the cross shaft D forms the cross head
to which the connecting rod G is attached, and when the piston moves the
motion of the connecting rod will give a rotatory motion to the main shaft by
means of the crank H, to which the connecting rod is attached. K is the
condenser, and L a double-acting air-pump placed horizontally, and worked
by the motion of the cross shaft D, by connecting the piston rod of the air
pump with the cross shaft by means of a prolongation of the arm F; the
valves for the air pump are placed in the box M, as shewn in section in
Figure 14. Returning now to both the Figures 10 and 11:-N and N' are
cog-wheels placed on the main shaft, as shewn in Drawing No. 2 & 3; and
O is a pinion gearing into both the wheels N¹ and N, and fixed to the shaft P,
which is placed below and equidistant from the two main shafts. Q is a
support for the main shafts. The steam cylinders may, if desired, be placed
at an inclination to each other, so as better to adopt themselves to the form
of the bottom of the vessel; and other modifications of details may be made in
the position or arrangement.
Having thus described the nature of my Invention, and the manner in
which it is to be performed, I would have it understood, that what I claim as
my Invention is,-
First, the equilibrium sliding valve working on or between two surfaces
having orifices therein, which orifices in each surface are respectively oppo-
site to and corresponding with those in the other surface, for the purpose of
counterbalancing the pressure of the valve as above described.
Secondly, the combination of two steam cylinders placed end to end for the
purpose of transmitting the power, by two main shafts, to a propeller shaft
placed equidistant from the two main shafts as described.
In witness whereof, I, the said Jean Baptiste Francois Mazeline, ainé,
have hereunto set my hand and seal, this Sixteenth day of July, in the
year of our Lord One thousand eight hundred and forty-nine.
F. MAZELINE, Ainé. (L.S.)

page_text: AND BE IT REMEMBERED, that on the Sixteenth day of July, in the
year of our Lord 1849, the aforesaid Jean Baptiste Francois Mazeline,
ainé, came before our said Lady the Queen in Her Chancery, and acknow-
ledged the Specification aforesaid, and all and every thing therein coniained
and specified, in form above written. And also the Specification aforesaid
was stamped according to the tenor of the Statute made for that purpose..
Enrolled the Sixteenth day of July, in the year of our Lord One thousand
eight hundred and forty-nine.