AN IMPROVED STEAM ENGINE
Year: 1866

page_text: LETTERS PATENT to Julien Bolvin, of No. 31, Rue d'Enghien, Paris, in
the Empire of France, Mechanician, for the Invention of "AN IMPROVED
STEAM ENGINE."
Sealed the 14th May 1867, 'and dated the 17th November 1866.
PROVISIONAL SPECIFICATION left by the said Julien Bolvin at the
Office of the Commissioners of Patents, with his Petition, on the 17th
November 1866.
I, JULIEN BOLVIN, of No. 31, Rue d'Enghien, Paris, in the Empire of
France, Mechanician, do hereby declare the nature of the said Invention for
"AN IMPROVED STEAM ENGINE," to be as follows:-
The following description of my Invention will be readily understood; on
reference to the accompanying Drawings.
Fig. 1 is a longitudinal elevation of my machine, which consists of a circular
iron box C, the lower part C¹ forms the steam chamber, whilst in the upper. C¹¹
the piston A moves, the crown or head of which form a cross bar, as shewn in
the transverse section Fig. 2, and terminates where the platforms V, V, com-
mence; these latter receive the pressure of the steam for setting the piston in
motion. K is the shaft forming the axis of rotation to the piston, and. to
which the large crank M is connected; this latter receives the end of the
rod D, the cross head of which is attached to the second crank N; which is
keyed to the driving shaft L, to which it communicates motion. The steam

page_text: is conducted to the parts V, V, by the pipe or channel E, Fig. 2, and passing
through the slide valve B.is distributed by the orifices a, a, Fig. 1, to the
steam ports b, b, of the steam chest; from whence it reaches one of the plat-
forms V, V, according to the position of the valve. Having exerted its power
it escapes by the pipe F, Fig. 2, which is a transverse section of the machine
taken at the vertical axis of the steam chest. Reciprocating motion is com-
municated to the slide valve B for opening or shutting the ports. b, b, by aid
of the eccentric. G and rod G³, which is actuated by the driving shaft L trans-
mitting motion to the crank I, Fig. 2, which in turn communicates motion to
the shaft J, the cranks H, H, and shaft O; d, d, are places for the escapement
of steam. The parts illustrated, but not previously described, are the
regulator R, the supports thereto R, the arm D₁ of the shaft D, the
pedestals T to the shaft K, the shaft of the butterfly valve P¹, and the
support P to the shaft L.
The construction of the slide valve, as described and illustrated, admits of
the reversing of the engine, and I can readily adapt it to any kind of machine
independently of the other parts of my Invention.
My improved engine is equally applicable to stationary, locomotive, or
marine engines; the small space it occupies rendering it especially applicable
to the latter.
:
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Julien Bolvin in the Great Seal Patent Office on the
17th May 1867.
TO ALL TO: WHOM THESE PRESENTS SHALL COME, I, JULIEN
BOLVIN, of No. 81, Rue d'Enghien, Paris, in the Empire of France,
Mechanician, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Seventeenth day of November, in the year of our
Lord One thousand eight hundred and sixty-six, in the twenty-ninth year of
Her.reign; did; for Herself, Her heirs and successors, give and grant unto
me, the said Julien Bolvin, Her special licence that I, the said Julien
Bolvin, my executors, administrators, and assigns, or such others as I, the
said Julien Bolvin, my.. executors, administrators, and assigns, should at
any time agree with, and no others, from time to time and at all times
thereafter during the term therein expressed, should and lawfully might
make, use, exercise, and vend, within the United Kingdom of Great Britain

page_text: and Ireland, the Channel Islands, and Isle of Man, an Invention for "An
IMPROVED STEAM ENGINE," upon the condition (amongst others) that I, the
said Julien Bolvin, my executors or administrators, by an instrument .in
writing under my, or their, or one of their hands and seals, should par-
ticularly describe and ascertain the nature of the said Invention, and in
what manner the same was to be performed, and cause the same to be filed
in the Great Seal Patent Office within six calendar months next and imme.
diately after the date of the said Letters Patent.
¡
:
NOW KNOW YE, that I, the said, Julien Bolvin, do hereby declare
the nature of my said Invention, and in what manner the same is, to be per-
formed, to be particularly described and ascertained in and by the following
statement and accompanying Drawings, that is to say::-..
Fig. 1 is, a longitudinal elevation of my machine; Fig. 2 is a transverse
section following the line 1, 2, of Figure 1; Fig. 3 is a plan of the
machine; Fig. 4 is the partly circular piston; Figs. 5, 6, and 7 represent in
plan and section the slide valve C.
Figures 1, 2, and 3 is a circular iron box, the lower part of which C forms
the steam chamber, whilst in the upper the piston A moves, the crown or
head of which forms a cross bar, as shewn in the transverse section Figure 2,
and terminates where the platforms V, V, commence; these latter receive at
their base the pressure of the steam for setting the piston in motion. K is
the shaft forming the axis of rotation to the piston, and to which the large
crank M is connected; this latter receives the end of the rod D, the cross
head of which is attached to the second crank N, which is keyed to the driving
shaft L, to which it communicates motion. The steam is conducted to the
parts V, V, by the pipe or channel E, Fig. 2, and passing through the slide
valve B is distributed by the orifices a, a, Fig. 1, to the steam ports b, b, of
the steam chest, from whence it reaches one of the platforms V, V, according
to the position of the valve. Having exerted its power it escapes by the
pipe F, Fig. 2, which is a transverse section of the machine taken at the
vertical axis of the steam chest. Reciprocating motion is communicated to
the slide valve B for opening or shutting the ports b; b, by aid of the eccentric
G and rod G', which is actuated by the driving shaft L, transmitting motion
to the crank I (Figure 2), which in turn communicates motion to the shaft J,
the cranks H, H, and shaft O; d, d, are places for the escapement of steam.
The parts illustrated, but not described, are the regulator R, the support
thereto R¹, the supports P to the shaft K, the butterfly valve P¹, the pulley
P", the cap S of the steam chest C', the supports T of the horizontal shaft
U, U, the stuffing boxes of the driving shaft, the fly wheel V, the frame X.

page_text: c', the orifice for the admission of steam; e", the orifice for the expulsion of
steam, and g¹ the interior space above the slide valve where the steam is,
which lessens the friction of the valve on the surface of the ports.
My improved engine, as already described, is suitable for stationary,
movable, or marine engines; the small space it occupies render it especially
applicable to the latter. It may be driven by steam, sulphuric ether vapour,
by carbonic acid, or any other expansive gas, and even by atmospheric
pressure or hydraulic.
The construction of the slide valve as herein described and illustrated
admits of the reversing the engine, and I can readily adapt it to any kind of
machine independently of the other parts of my Invention.
Having thus described my Invention, and the mode of action thereof, what
I claim and desire to secure by Letters Patent is, the peculiar construction
of the machine as herein described and illustrated by the accompanying
Drawings.
In witness whereof, I," the said Julien Bolvin, have hereunto set my
hand and seal, this Fifteenth day of May, in the year of our Lord One
thousand eight hundred and sixty-seven.