IMPROVEMENTS TANAM & MIAY IN STEAM BOILERE PREVENTING AND REMOVING INCRUSTATION
Year: 1873

page_text: LETTERS PATENT to Robert Hatfull, of 170, High Street, Deptford,
in the County of Kent, Chemist, for the Invention of "IMPROVEMENTS
TANAM & MIAY IN STEAM BOILERE "
PROVISIONAL SPECIFICATION left by the said Robert Hatfull at tho
Office of the Commissioners of Patents, with his Petition, on the
24th January 1873.
I, ROBERT HATFULL, of 170, High Street, Deptford, in the County of
Kent, Chemist, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN PREVENTING AND REMOVING INCRUSTATION IN STEAM
BOILERS," to be as follows:-
My Invention consists in the preparation and use of an improved
fluid for the purpose of removing the incrustation formed in steam
In order
boilers and for preventing the formation of such incrustation.
to make this fluid I take forty parts of carbonate of soda, twenty parts
of carbonate of potash, four parts of animal charcoal, and two parts of
terra japonica (cutch); these ingredients I dissolve in twenty gallons of
water. The fluid thus formed I introduce into the boiler in the pro-

page_text: portion of about half a pint to every eight hundred gallons of water,
more or loss, according to the quality of the food water supplied to the
boiler.
The proportions of tho several ingredients may be varied, to suit
different qualitics of water, and oak bark may be substituted for the 5
terra japonica if found desirable.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Robert Hatfull in the Great Seal Patent Office
on the 23rd July 1873.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ROBERT 1
HATFULL, of 170, High Street, Deptford, in the County of Kent,
Chemist, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-fourth day of January, in the year of
our Lord One thousand eight hundred and seventy-three, in the thirty- 1
sixth year of Her reign, did, for Herself, Her heirs and successors, give
and grant unto me, the said Robert Hatfull, Her special licence that I, the
said Robert Hatfull, my executors, administrators, and assigns, or such
others as I, the said Robert Hatfull, my exccutors, administrators, and
assigns, should at any time agree with, and no others, from time to 2
time and at all times thereafter during the term therein expressed,
should and lawfully might make, usc, exercise, and vend, within tho
United Kingdom of Great Britain and Ireland, the Channel Islands, and
Isle of Man, an Invention for "IMPROVEMENTS IN PREVENTING AND REMOVING
INCRUSTATION IN Steam Boilers," upon the condition (amongst others) that 2
I, the said Robert Hatfull, my executors or administrators, by an in-
strument in writing under my, or their, or one of their hands and scals,
should particularly describo and ascertain the nature of the said
Invention, and in what manner the samo was to be performed, and
cause the same to be filed in the Great Scal Patent Office within six 3
calendar months next and immediately after the date of the said Letters
Patent.

page_text: performed, to be particularly described and ascertained in and by the
following statement:-
My Invention consists in the preparation and use of an improved fluid
for the purpose of removing the incrustation formed in steam boilers,
and also for preventing the formation of such incrustation. In order to
make this fluid I take from forty to sixty pounds of carbonate of soda,
to which I add from four to twenty-four pounds of carbonate of potash,
making sixty-four pounds. To this mixture I add about four pounds of
animal charcoal, and two pounds of terra japonica (cutch). Theso
ingredients I dissolve in twenty gallons of water, and tho fluid thus
formed I introduce into the boiler in the proportion of about half a pint
to every eight hundred gallons of water, more or less, according to the
quality of the feed water supplied to the boiler.
The proportions of the ingredients may be variod to suit different
qualities of water. Oak bark may sometimes with advantage bo sub-
stituted for the terra japonica, and kaso may be used instead of carbonate
of soda if thought desirable.
Having now described the nature of my Invention of improvements
in preventing and removing incrustation in steam boilors, and
explained the manner of carrying the same into effect, I wish it to bo
understood that under the above in part recited Letters Patent I claim,
the preparation and use of the fluid as above described for the purposes
herein set forth.
In witness whereof, I, the said Robert Hatfull, have hereunto set
my hand and scal, this Twenty-second day of July, in the year of
our Lord One thousand eight hundred and seventy-three.