AN IMPROVED COMPOSITION FOR COATING STEAM BOILERS
Year: 1874

page_text: LETTERS PATENT to James Stone, of No. 167, Gray's Inn Road, in
the County of Middlesex, Gentleman, for the Invention of "AN
IMPROVED COMPOSITION FOR COATING STEAM BOILERS."
Sealed the 27th April 1875, and dated the 4th November 1874.
PROVISIONAL SPECIFICATION left by the said James Stone at the
Office of the Commissioners of Patents, with his Petition, on the
4th November 1874.
I, JAMES STONE, of No. 167, Gray's Inn Road, in the County of
Middlesex, Gentleman, do hereby declare the nature of the said
Invention for "AN IMPROVED COMPOSITION FOR COATING STEAM BOILERS,"
to be as follows:-
This Invention relates to the production or manufacture and appli-
cation of an improved and more effective composition for coating certain
parts of steam boilers in order more perfectly to retain the heat in such
boilers and to prevent radiation of the heat therefrom, by the
application and use of which composition a very great saving in the

page_text: consumption of fuel will be accomplished, and the speedy generation
of steam in the boilers will be much more facilitated than hitherto.
The improved coating composition I propose to make as follows:—I
take pounded glass, prepared as mentioned in the Specification of the
Letters Patent which were granted to B. Hunt, on the 6th day of ŏ
October 1871, No. 2652, for the Invention of "Improvements in or
Connected with Steam Boilers," such Invention having been communi-
cated by me to the said B. Hunt whilst I resided at Ceylon; such
pounded glass I combine or mix with carbonate of lime, sulphate of
lime, silica, silicate of soda, alum, and soot or charcoal, which materials 1
in combination I have found to be the best non-conductors or imperfect
conductors of electricity, and therefore the most suitable for accom-
plishing the objects of my present Invention.
The proportions or quantities of the above-named materials that I
prefer to use and apply to the part or parts of the boilers to be coated 1
will be as follows :—
Of the pounded glass, forty parts by weight;
Of silica, forty parts by weight;
Of sulphate of lime, forty parts by weight;
Of carbonate of lime, twelve parts by weight;
Of silicate of soda, one part by weight;
Of soot or charcoal, four parts by weight, and
Of alum, one part by weight.
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I do not limit myself exactly to the above-named proportions, as they
may be varied as required, and I reserve to myself the right of 2
using the whole of the above-named substances in combination, or a
part or parts thereof only, but always in combination with the pounded
glass.
The coating composition will be laid on the part or parts of the
boiler intended to be coated either prepared as a cement or in the form 3
of a powder.
When the part or surface of the boiler to be coated is in a vertical
position, a small quantity of hair or fibre of some suitable kind will have
to be mixed with the coating to hold or bind it together.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said James Stone in the Great Seal Patent Office on the
4th May 1875.
TO ALL TO WHOM. THESE PRESENTS SHALL COME, I, JAMES'
STONE, of. No. 167, Gray's Inn Road, in the County of Middlesex,
Gentleman, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Fourth day of November, in the year of our
Lord One thousand eight hundred and seventy-four, in the thirty-eighth
year of Her reign, did, for Herself, Her heirs and successors, give and
grant unto me, the said James Stone, Her special licence that I, the
said James Stone, my executors, administrators, and assigns, or such
others as I, the said James Stone, my exccutors, 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 "AN IMPROVED COMPOSITION FOR COATING STEAM.
BOILERS," upon the condition (amongst others) that I, the said James
Stone, 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 James Stone, do hereby declare
the nature of my said Invention, and in what manner the same is to be
performed, to be particularly described and ascertained in and. by the..
following statement, that is to say :-
This Invention relates to the production or manufacture and appli-
cation of an improved and more effective composition for coating
certain parts of steam boilers in order more perfectly to retain the heat
in such boilers, and to prevent radiation of the heat therefrom, by the
application and use of which composition a very great saving in the
consumption of fuel will be accomplished and the speedy generation
of steam in the boilers will be much more facilitated than hitherto.

page_text: The improved coating composition I propose to make as follows :—I
take pounded glass and combine or mix it with carbonate of lime,
sulphate of lime, silica, silicate of soda, alum, and soot or charcoal,
which materials in combination I have found to be the best non-
conductors or imperfect conductors of electricity, and therefore the most
suitable for accomplishing the objects of my present Invention.
The proportions or quantities of the above-named materials that I
prefer to use and apply to the part or parts of the boilers to be coated
I will be as follows:-
-
Of the pounded glass, forty parts by weight;
Of silica, forty parts by weight;
Of sulphate of lime, forty parts by weight;
Of carbonate of lime, twelve parts by weight;
Of silicate of soda, one part by weight;
Of soot or charcoal, four parts by weight, and
Of alum, one part by weight.
I do not limit myself exactly to the above-named proportions, as they
may be varied as required, and I reserve to myself the right of
using the whole of the above-named substances in combination, or a
part or parts thereof only, but always in combination with the pounded a
glass.
The coating composition will be laid on the part or parts of the
boiler intended to be coated, either prepared as a cement or in the form
of a powder.
When the part or surface of the boiler to be coated is in a vertical
position a small quantity of hair or fibre of some suitable kind will have
to be mixed with the coating to hold or bind it together.
Having thus described the nature and particulars of my said In-
vention, I claim, "The Improved Composition for Coating Steam
Boilers," substantially as herein set forth.
In witness whereof, I, the said James Stone, have hereunto set my
hand and seal, this Thirtieth day of April, in the year of our
Lord One thousand eight hundred and seventy-five.
JAMES STONE. (1.0)
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