AN ENGINE FOR PRODUCING MOTIVE, POWER, APPLICABLE TO VARIOUS PURPOSES
Year: 1833

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, BATHELEMY
RICHARD Comte de PREDAVAL, of Leicester Place, Leicester Square, in the
County of Middlesex, Engineer, send greeting.
WHEREAS His present most Excellent Majesty King William the Fourth,
by His Letters Patent under the Great Seal of Great Britain, bearing date
at Westminster, the Nineteenth day of November, in the fourth year of
His reign, did, for Himself, His heirs and successors, give and grant unto me,
the said Barthelemy Richard Prédaval, His especial licence, that I, the said
Barthelemy Richard Predaval, my exors, adiñiors, and assigns, or such others
as I, the said Barthelemy Richard Predaval, my exors, adñors, 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 law-
fully might make, use, exercise, and vend, within England, Wales, and
the Town of Berwick-upon-Tweed, my Invention of "AN ENGINE FOR
PRODUCING MOTIVE, POWER, APPLICABLE TO VARIOUS PURPOSES;" in which said
Letters Patent is contained a proviso obliging me, the said Barthelemy Richard
Comte de Predaval, by an instrument in writing under my hand and seal,
particularly to describe and ascertain the nature of my said Invention, and
in what manner the same is to be performed, and to cause the same to be
inrolled in His said Majesty's High Court of Chancery within six calendar
months next and immediately after the date of the said 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
Barthelemy Richard Predaval, do hereby declare the nature of my said
Invention to consist in a rotary engine receiving its motion from the buoyancy
of any suitable fluid acting on one part of it, and from the inclination of a
corresponding part to fall by its own weight in vacuo; and in further com-
pliance with the said proviso I, the said Barthelemy Richard Predaval, do
hereby describe the manner in which my said Invention is to be performed
by the following statement thereof, reference being had to the Drawing
annexed, and to the figures and letters marked thereon, that is to say :-
DESCRIPTION OF THE DRAWING.
Figure 1 is a side view of an engine made on the principle of my said
Invention, with part of it removed the better to shew its internal construction.
M, M, M, is an outer circular case supported on the stand B, B. P is a
hollow water and air tight drum or cylinder, corresponding in shape with the
case M and turning on an axis N, and working in a stuffing box; this axis is
fixed to a cylinder or drum, and passes through the case at each side, and is
supported by it. The external surface of the drum should be perfectly smooth.
V, V, represents the edge of a square frame, which I call the division frame,
and is shewn separately at Figure 9. This frame contains pistons or friction
plates, which are more particularly described hereafter, and which fill up the
space between the inner drum and the outer case on all four sides, and should
press close upon the inner drum in the manner of pistons, as will be more
particularly explained hereafter; they divide the space between the outer case
and inner drum into two parts. It will be observed that the friction plates are
shewn in this Figure in a position behind this axis, whence it follows that one
part of the space divided is smaller than the other, the larger part being
formed by the two pieces Mx and MXX, before mentioned as being
removed to shew the interior arrangement of the engine; these parts being
put to their places complete the outer case. They are screwed to the outer
part of the case M by flanges at F, F, and should make the larger compart-
ment of the outer case air tight; the smaller portion of the space between the
outer case and the drum, say at M, is then filled with water through the pipe
X,X, and it should here be stated that the proportions of the engine should be
so calculated that the weight of the water in the case may be twice and a half
heavier than that part of the cylinder or drum which is to be surrounded by the
water. The pipe X, X, is kept in its place by a bracket or arm Z projecting
from the side of the outer case, and this pipe is furnished with a stopcock at
each end. At the top of the pipe is a flat reservoir L, above which one of the

page_text: stopcocks is placed. This reservoir should be equal in extent on surface to
the extent of surface on the plane of projection exhibited by the water in the
outer case. H is a cock to allow the air to escape when the water is entering,
and U is another air cock, to which an air pump is to attached to cause the
vacuum in that part of the space between the case and the drum opposite to
where the water is. Y is a mercurial guage to ascertain when the vacuum is
sufficiently perfect. Now, it results from a machine so constructed that that
part of the drum P which is in the water will have a constant tendency to rise
or be buoyed up by the water, while the other part of the drum which is in
vacuo will have as constant a tendency to fall, or, in other words, that part of
the drum which is in vacuo will always be heavier than that which is in the
water, and the consequence will be that the drum will be constantly turning on
its axis so long as the vacuum is kept up in one part of the machine and the
water is in the other, and it is scarcely necessary to add that the axis in that
case may be made to turn any working shaft. Figure 2 is an elevation of a
part of the machine in section. Figure 3 is a side elevation of a part of the
machine in section. Figure 4 is a section through the case and drum, taken
at the red line in Fig. 2. Figure 5 is a separate view of the hollow frame
before alluded to, having the four pistons inclosed, one in each side, and one
in each end of it. The pistons are acted upon or pressed out by small springs
acting as here shewn between the bridges b, b, b, b, and the pistons. The
pistons are placed in the frame from the inside, and the screw nuts e, e, e, e, e, e,
screwed on to the end of the springs that protrude through a small hole made in
the top of each bridge for that purpose. Figure 6 is a view of the hollow
frame aforesaid in section, with two of the pistons ready to be placed in it
from the inside, after which the other two would also be placed in like manner
from the inside. Figure 7 is an edge view of a part of one of the pistons, the
part colored green being leather or other packing, and that colored red,
brass, copper, or other metal plates on each side of it to hold it firmly
together. Figure 8 is a view of one of the bridges on the edge of the hollow
frame, on a larger scale. It will be seen that there is a small plate of
iron immediately under the spring on which it acts, and which extends across
the leather, and rests at each end upon the brass or copper plates of the piston
and Figure 9 is a separate view of the said frame with the pistons removed.
Figure 10 is a plan of the reservoir L.
Now, whereas my said engine may be made of iron, copper, or any suitable
metal, and its particular form may of course be varied to suit particular
localities; but whereas I claim as my Invention the engine or machine
herein-before described, acting by a joint power derived from the buoyancy

page_text: of a body in fluids, and the weight of a body in vacuo; and such my Invention
being, to the best of my knowledge and belief, entirely new, and never
before used within that part of His said Majesty's United Kingdom of Great
Britain and Ireland called England, His said Dominion of Wales, or Town of
Berwick-upon-Tweed, I do hereby declare this to be my Specification of the
same, and that I do verily believe this my said Specification doth comply in all
respects, fully and without reserve or disguise, with the proviso in the said
herein-before in part recited Letters Patent contained; wherefore I do hereby
claim to maintain exclusive right and privilege to my said Invention.
In witness whereof, I, the said Barthelemy Richard Comte de Predaval,
have hereunto set my hand and seal, this Seventeenth day of May,
One thousand eight hundred and thirty-four.
BARTH. RICHARD CT (L.S.)
REDAVAL.
AND BE IT REMEMBERED, that on the Seventeenth day of May,
in the year of our Lord 1834, the aforesaid Barthelemy Richard Comte de 1
Predaval came before our said Lord the King in His Chancery, and acknow-
ledged the Specification aforesaid, and all and every thing therein contained
and specified, in form above written. And also the Specification aforesaid was
stamped according to the tenor of the Statute made for that purpose.
Inrolled the Nineteenth day of May, in the year of our Lord One 2
thousand eight hundred and thirty-four.