A NEW MANU- FACTURE OF HEAVY OIL
Year: 1859

page_text: LETTERS PATENT to Edward Dorsett, of No. 76, Old Broad Street, in the
City of London, Tar Distiller, for the Invention of "A NEW MANU-
FACTURE OF HEAVY OIL."
Sealed the 22nd May 1860, and dated the 30th November 1859.
PROVISIONAL SPECIFICATION left by the said Edward Dorsett at the
Office of the Commissioners of Patents, with his Petition, on the 30th
November 1859.
I, EDWARD DORSETT, of No. 76, Old Broad Street, in the City of London,
Tar Distiller, do hereby declare the nature of the said Invention for "A NEW
MANUFACTURE OF HEAVY OIL," to be as follows:-
The vapours or gases given off in the manufacture of artificial fuel have
hitherto generally been allowed to escape into the air and be wasted, occasioning
a nuisance, and being attended with disagreeable and injurious effects. Now, I
have ascertained that these vapours or gases may be collected on their passage
from the retorts, ovens, or stills, by means of suitable apparatus, and converted
into a heavy oil, so as to produce therefrom a product commercially valuable,
and obviate in a great manner the waste and nuisance attendant on the
manufacture of artificial fuel, as heretofore practiced.
The manner in which I perform or carry out my Invention is as follows;-
I convey the vapours or gases from the retorts, ovens, or stills by means of
suitable pipes passing through a condensing cylinder or refrigerator, by which

page_text: *process the vapours or gases become condensed, and a large amount of oil
obtained therefrom, a receiver or other suitable vessel being used to receive
:the oil.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Edward Dorsett in the Great Seal Patent Office on the
26th May 1860.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, EDWARD
DORSETT, of No. 76, Old Broad Street, in the City of London, Tar Distiller,
send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Thirtieth day of November, in the year of our Lord
One thousand eight hundred and fifty-nine, in the twenty-third year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me,
the said Edward Dorsett, Her special licence that I, the said Edward
Dorsett, my executors, administrators, and assigns, or such others as I, the
said Edward Dorsett, 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 "A
NEW MANUFACTURE OF HEAVY OIL," upon the condition (amongst others) that I,
the said Edward Dorsett, my executors or administrators, 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 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 immediately after
the date of the said Letters Patent.
NOW KNOW YE, that I, the said Edward Dorsett, 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 (that is to say) :-
:-
In the manufacture of certain descriptions of artificial fuel the materials
are exposed to heat in retorts, and the vapours or gases arising therein allowed
to escape into the air to the annoyance of the surrounding neighbourhood;
instead of allowing the vapours or gases so given off in the manufacture of
artificial fuel to escape into the air I cause them to be conveyed from the

page_text: retorts, ovens, or stills, through pipes in a condensing tank or refrigerator to
any suitable receiver, by which process the vapours or gases become condensed,
and produce a large amount of heavy oil.
The manner in which my Invention is to be performed or carried into effect
will be clearly understood by referring to the figures and letters on the accom-
panying Sheet of Drawings, in which Fig. 1 is an end elevation, Fig. 2 a
transverse section, and Fig. 3 a longitudinal section of the apparatus employed
to collect the product of the gases from a retort or oven charged with the
materials for making artificial fuel. The materials are placed in the usual
manner in the body of the ordinary retort or oven a, having at both ends the
doors b, which are closed with the bars c, by means of the lugs & and wedges
c, the joints of the doors being afterwards luted to the frame with clay. The
vapours or gases as they are given off pass through pipes f connecting the
retort with the main conducting pipe g, through which the gases pass onward
to the condensing pipe h placed in the condensing tank i, the effect of which
is to condense the vapours or gases into a heavy oil which falls into the cistern
or receiver k. The pipes are furnished with caps 1, which can be removed
when the pipes require clearing, but are fitted tight when the apparatus is in
operation. The cock m is employed for regulating the quantity of water in
the condensing tank i.
Having thus described the nature of my said Invention, and in what manner
the same is to be performed, I wish it to be understood that I do not
confine myself to the precise details herein set forth and referred to; but I
claim as my Invention the manufacture of heavy oil by condensing the
vapours or gases given off in the manufacture of artificial fuel in retorts, as
above described.
In witness whereof, I, the said Edward Dorsett, have hereunto set my
hand and seal, this Eighteenth day of May, in the year of our Lord
One thousand eight hundred and sixty
Signed, sealed, and delivered by the
within-named Edward Dorsett, in
the presence of
EDWARD T. HUGHES,
EDWARD DORSETT. (L.S.)
Patent Agent,
London.