IMPROVEMENTS IN THE APPLICATION AND PREPARATION OF COAL TAR;
Year: 1848

page_text: WHEREAS Her present most Excellent Majesty Queen Victoria, by Her
Royal Letters Patent under the Great Seal of the United Kingdom of Great
Britain and Ireland, bearing date at Westminster. the Nineteenth day of
October (One thousand eight hundred and forty-eight), in the twelfth year of
Her reign, did, for Herself, Her heirs and successors, give and grant unto me,
the said Robert Angus Smith, my exors, admors, and assigns, Her especial licence,
full power, sole privilege and authority, that I, the said Robert Angus Smith,
my exors, adñiors, and assigns, or such others as I, the said Robert Angus
Smith, my exors, adññiors, or assigns, should at any time agree with, and no
others, from time to time and at all times during the term of years therein
expressed, should and lawfully might make, use, exercise, and vend, within
England, Wales, and the Town of Berwick-upon-Tweed, my Invention of
"IMPROVEMENTS IN THE APPLICATION AND PREPARATION OF COAL TAR;" in which
said Letters Patent is contained a proviso that I, the said Robert Angus Smith,
shall cause a particular description of the nature of my said Invention, and in
what manner the same is to be performed, by an instrument in writing under
my hand and seal, to be inrolled in Her said Majesty's High Court of Chancery
within six calendar months next and immediately after the date of the said
in part recited Letters Patent, as in and by the same, reference being
thereunto had, will more fully and at large appear.
NOW KNOW YE, that in compliance with the said proviso, I, the said

page_text: Robert Angus Smith, do hereby declare that the nature of my said Invention,
and the manner in which the same is to be performed, are fully described
and ascertained in and by the following statement thereof, that is to say :-
My Invention consists of the application and preparation of coal tar to the
interior surfaces of water pipes, so as to obtain a coating to such surfaces.
And in order that my Invention may be most fully understood and readily
carried into effect, I will proceed to describe the means pursued by me.
The coal tar to be used for the purposes of my Invention is first to be reduced
by distillation or otherwise, as is well understood, so as to obtain the product
which consists of a thick pitch-like mass, which is the product of coal tar
which I employ, and the coal tar in this state is to be kept melted at a tem-
perature of about three hundred degrees (or to such a temperature as to keep
the matter fluid) of Fahrenheit's in a suitable open vessel of a size and depth
depending on the pipes to be acted on according to my Invention. The pipes
to be coated are first to have their interior surfaces cleansed from oxide, so as
to offer a clean metal surface, and which I prefer to coat over with linseed oil,
particularly where the pipes cannot be subjected immediately to the coal tar.
The water pipes are to be heated to about three hundred degrees of Fahren-
heit in a suitable stove and then immersed in the melted coal tar, and there
to remain for about an hour, when the coal tar will generally be found to have
attached itself closely to the surfaces of the pipe both inside and out; my
chief object, however, is to get a good coating on the inside. And in
removing the pipes from the melted coal tar I have found it desirable to pour
a quantity of linseed oil on the coated surfaces, which I find to have the effect
of removing any excess of the coal tar, and the oil running into the coal tar
keeps it fluid for the further process, and prevents its becoming unsuitable for
subjecting further quantities of pipes thereto. In place of heating the pipes
before immersing, a like effect will be produced by placing the pipes, when the
interior surface are clean, into the melted bath of coal tar, and allowing them
to remain therein some time after they have become as hot as the coal tar, and
this process I have generally found to take about one and a half hours.
Having thus described the nature of my Invention, and the manner in
which the same is to be performed, I would remark, that I do not confine
myself to the precise details as herein described, but what I claim is the
coating the interior of water pipes with coal tar by the aid of heat.
In witness whereof, I, the said Robert Angus Smith, have hereunto set
my hand and seal, this Eighteenth day of April, in the year of our
Lord One thousand eight hundred and forty-nine.
ROBERT ANGUS (L.S.) SMITH.

page_text: AND BE IT REMEMBERED, that on the Eighteenth day of April, in
the year of our Lord 1849, the aforesaid Robert Angus Smith came before
our said Lady the Queen in Her Chancery, and acknowledged the Speci-
fication aforesaid, and all and every thing therein contained and specified,
in form above written. And also the Specification aforesaid was stamped
according to the tenor of the Statute made for that purpose.
Enrolled the Nineteenth day of April, in the year of our Lord One
thousand eight hundred and forty-nine.