IMPROVEMENTS IN OBTAINING MOTIVE POWER AND IN EVAPORATING LOUIDS
Year: 1860

page_text: LETTERS PATENT to Oswald Dodd Hedley, of Newcastle-upon-Tyne,
Gentleman, for the Invention of "IMPROVEMENTS IN OBTAINING MOTIVE
POWER AND IN EVAPORATING LOUIDS"
Sealed the 11th December 1860, and dated the 30th July 1860.
PROVISIONAL SPECIFICATION left by the said Oswald Dodd Hedley at
the Office of the Commissioners of Patents, with his Petition, on the
30th July 1860.
I, OSWALD DODD HEDLEY, of Newcastle-upon-Tyne, Gentleman, do hereby
declare the nature of the Invention for "IMPROVEMENTS IN OBTAINING MOTIVE
POWER AND IN EVAPORATING LIQUIDS," to be as follows:―
This Invention has for its object improvements in obtaining motive power
and in evaporating liquids. For these purposes, I take the exhaust steam from
a steam engine; by means of the same I heat air to as high a temperature as
the said steam will raise it, and this I do by causing the air to pass through
channels or passages heated externally by the steam, or the steam may be
otherwise applied to heat the air. I then, by means of a forcing apparatus,
compress this heated air until it is raised to a high pressure and temperature,
and the air so heated I apply to evaporate water in a boiler, in order to gene-
rate steam, which is then worked in a steam engine in the usual manner.
so heated and compressed may also be applied to evaporate liquids where it is
not required to generate steam for working a steam engine.
Air

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Oswald Dodd Hedley in the Great Seal Patent Office on
the 30th January 1861.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, OSWALD
DODD HEDLEY, of Newcastle-upon-Tyne, Gentleman, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Thirtieth day of July, in the year of our Lord One
thousand eight hundred and sixty, in the twenty-fourth year of Her reign, did,
for Herself, Her heirs and successors, give and grant unto me, the said
Oswald Dodd Hedley, Her special licence that I, the said Oswald Dodd Hedley,
my executors, administrators, and assigns, or such others as I, the said Oswald
Dodd Hedley, 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 and Ireland, the
Channel Islands, and Isle of Man, an Invention for "IMPROVEMENTS IN
OBTAINING MOTIVE POWER AND IN EVAPORATING LIQUIDS," upon the condition
(amongst others) that I, the said Oswald Dodd Hedley, my executors or admi-
nistrators, by an instrument in writing under my, or their, or one of their hands
and seals, should particularly describe and ascertain the nature of the said In-
vention; 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 immediately after the date of the said Letters Patent:
NOW KNOW YE, that I, the said Oswald Dodd Hedley, do hereby declare
the nature of the said Invention, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement thereof, that is to say :-
This Invention has for its object improvements in obtaining motive power
and in evaporating liquids. For these purposes, I take the exhaust steam from
a steam engine; by means of the same, I heat air to as high a temperature as
the said steam will raise it, and this I do by causing the air to pass through
channels or passages heated externally by the steam, or the steam may be
otherwise applied to heat the air. I then, by means of a forcing apparatus,
compress this heated air until it is raised to a high pressure and temperature,

page_text: apply to raporate watch one in order to gene-
rate steam which is then worked in a steam engine in the usual manner.
Air
so heated and compressed may also be applied to evaporate liquids where it is
not required to generate steam for working a steam engine.
In place of working with air alone, as above described, a mixture of air and
steam may be similarly employed.
Having thus stated the nature of my said Invention, I will proceed more
fully to describe the manner of performing the same.
DESCRIPTION OF THE DRAWING.
Which represents a longitudinal section of machinery, arranged and com-
bined according to my Invention. a is a chamber into which atmospheric air
may freely enter at the opening b, which is shown to be covered with a valve,
which, however, when the engine is at work, may be kept constantly open;
c, c, are a series of tubes within a vessel d, d, into which steam is constantly
supplied, and such steam is, by preference, exhaust steam from a steam
engine. The water resulting from the condensation of steam is run off at the
bottom of the vessel by the ordinary well-known apparatus (not shown in the
Drawing), or it may be used as feed water. The air thus or otherwise heated
is received into the vessel or chamber e, e, from which it passes into the cylin-
der f, either above or below the piston 9, according to the direction in which
the piston g is being moved. The valves h and i open and close as the piston
changes the direction of its motion. The piston g is actuated by a steam
engine, and, by preference, worked by the steam generated in the steam boiler
m, or other suitable motive power may be employed for actuating the piston.
The air received into the cylinder f is alternately forced out therefrom through
the passages, which are respectively closed by the valves j and k, into and
through the tubes 1, 2, in the steam boiler mn, and thence into the receiver n, at
the further end of the steam boiler; and in this manner may the heated air be
compressed to any desired extent, and the heat thereof largely increased. The
heated air thus compressed in the chamber and tubes of the steam boiler will
give off some of its heat to the water in the boiler, and generate steam to be
used for actuating a steam engine, or the steam thus generated may be used
for other purposes; or in place of a steam boiler m being employed, another
vessel suitable for evaporating fluids may be used. The heated and compressed
air in the receiver n is allowed to pass therefrom to work an engine of any
suitable form and construction for being actuated by heated and compressed
air, as is well understood. By thus combining machinery, atmospheric air
will be heated, then compressed so as to occupy less space, and consequently

page_text: become of higher. temperature and suitable for evaporating water or other
fluids:
It is preferred that the whole of the machinery shown in the Drawing
should be clothed, to prevent as much as possible any radiation of the heat,
which would otherwise take place.
Having thus described the nature of my said Invention, and the manner of
performing the same, I would have it understood that I make no claim to
any of the parts of the machinery: separately; but what I claim is, the com-
bination herein described.
In witness whereof, I, the said Oswald Dodd Hedley, have hereunto set
my hand and seal, this Twenty-eighth day of January, in the year
of our Lord One thousand eight hundred and sixty-one.
OSWALD DODD HEDLEY. (L.S.)