IMPROVE- MENTS IN THE PREVENTION OF INCRUSTATION AND CORROSION OF STEAM ENGINE D.
Year: 1860

page_text: LETTERS PATENT to William Allen, of Great Alfred Street, in the Town
and County of Nottingham, Engineer, and William Allen, of Carrington,
in the County of Nottingham, Engineer, for the Invention of "IMPROVE-
LETTERS PATENT to William Allen, of Great Alfred Street, in the Town
and County of Nottingham, Engineer, and William Allen, of Carrington,
in the County of Nottingham, Engineer, for the Invention of "IMPROVE-
MENTS IN THE PREVENTION OF INCRUSTATION AND CORROSION OF STEAM ENGINE
D.
Sealed the 11th January 1861, and dated the 18th July 186
.
PROVISIONAL SPECIFICATION left by the said William Allen and William
Allen, at the Office of the Commissioners of Patents, with their Petition,
on the 18th July 1860.
We, WILLIAM ALLEN, of Great Alfred Street, in the Town and County of
tho Town of Nottingham, Engineer, and WILLIAM ALLEN, of Carrington, in the
County of Nottingham, Engineer, do hereby declare the nature of the said
Invention for "IMPROVEMENTS IN THE PREVENTION OF INCRUSTATION AND CORROSION
OF STEAM ENGINE BOILERS," to be as follows:-
Our Invention has for its object the prevention of incrustation and corrosion
of steam engine boilers, and consists in the use of ammoniacal liquid obtained
from coal tar or gas tar. When a steam engine boiler has become foul and
requires to be cleansed from the incrustation which has been formed within
it, we pour into it some three or four buckets of the ammoniacal liquid
according to the size of the boiler, and the degree or extent of its filthiness.
In starting a new boiler we would propose to paint the inside of it with

page_text: several coats of gas tar which would render it less susceptible to incrustation
or corrosion for a considerable time until the nature of the tar had perished;
we would then use as occasion required, and in such quantity as was necessary,
the ammoniacal liquid which would entirely prevent all incrustation and
materially attenuate the power of corrosion. When a boiler has been cleaned,
and before again starting for work, we propose to put four or six buckets of
the ammoniacal liquid into it according to the size thereof, and this may be
repeated every two or three weeks; much depends, however, upon the purity
of the water used. The liquid may be applied to the boilers either through
the man-hole, safety valve, or pumps, as most convenient, and by so doing the
feed pipes will be prevented from corroding. When the liquid has been
applied as before mentioned it will be advisable to open the safety valve or
other outlet which should remain open for a few seconds while the steam
is rising to allow the effluvia to escape and prevent unpleasant odour finding
its way into the rooms in immediate proximity of the boiler.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said William Allen and William Allen, in the Great Seal Patent
Office on the 12th January 1861.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, WILLIAM
ALLEN, of Great Alfred Street, in the Town and County of the Town of
Nottingham, Engineer, and WILLIAM ALLEN, of Carrington, in the County of
Nottingham, Engineer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Thirteenth 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 us,
the said William Allen and William Allen, Her special licence that we,
the said William Allen and William Allen, our executors, administrators,
and assigns, or such others as we, the said William Allen and William
Allen, our 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 THE PREVENTION
OP INCEUSTATION AND CORROSION OF STEAM ENGINE BOILERS," upon the condition
(amongst others) that we, the said William Allen and William Allen, our

page_text: executors or administrators, by an instrument in writing under our or their hands
and seals, or under the hand and seal of one of us, or them, 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 we, the said William Allen and William Allen,
do hereby declare the nature of the said Invention, and in what manner tho
same is to be performed, to be particularly described and ascertained in and
by the following statement thereof, that is to say :-
The object of our Invention is the prevention of incrustation and corrosion
in steam engine boilers, and the Invention consists in the use or employment
for that purpose of ammoniacal liquid obtained from coal tar or gas tar. When
a steam engine boiler has become foul, and requires to be cleansed from the
incrustation which has been formed within it, we pour into it some three or
four buckets of the said ammoniacal liquid according to the size of the boiler,
and the degree or extent of its filthiness. In starting a new boiler we propose
to paint the inside of it with several coats of gas tar which would render it
less susceptible to incrustation or corrosion for a considerable time, until in
fact the nature of the tar had perished; we then use as occasion requires,
and in such quantity as may be necessary, the ammoniacal liquid obtained
from coal tar or gas tar, which would entirely prevent all incrustation and
materially attenuate the power of corrosion. When a boiler has been cleaned
and before again starting it for work, we propose to pour four or six buckets
of the ammoniacal liquid into it according to the size thereof, and this may
be repeated every two or three weeks; much depends, however, upon the
purity of the water used.
The ammoniacal liquid may be applied to the boilers either through the
man-hole or through the safety valve, or through the pumps, as may be found
most convenient, and by thus applying the said liquid the feed pipes will be
prevented from corroding. When the liquor has been applied as herein.before
mentioned it will be advisable to open the safety valve or other outlet which
should remain open for a few seconds while the steam is rising so as to allow
the effluvia to escape, and thus prevent any unplesant odour finding its way
into the rooms in the immediate proximity of the boiler. Our Invention is
applicable to all boilers whether of high or low pressure or locomotive.
Having now described the nature of our said Invention, and in what manner
the same may be performed, we declare that what we claim as constituting our
said Invention is,-

page_text: First, the employment of ammoniacal liquid obtained from coal tar or
gas tar for the purpose of preventing incrustation and corrosion in steam engine
boilers.
Second the preparing of steam engine boilers by painting the inside thereof
with coats of gas tar for the purpose of preventing incrustation therein.
In witness whereof, we, the said William Allen and William Allen,
have hereunto set our hands and seals, this Tenth day of January
in the year of our Lord One thousand eight hundred and sixty-
one
Witness,
. GEO. JON. ROBINSON.
Patent Agent,
Nottingham.
WILLIAM ALLEN. (L.S.)
WILLIAM ALLEN. (L.s.)