IMPROVEMENTS IN THE MANUFACTURE OF ASPHALT OR COMPOSITION ADAPTED FOR PAVING AND OTHER SIMILAR UBES
Year: 1871

page_text: LETTERS PATENT to George Evans, of Norwich, in the County of
Norfolk, Gas Manager, for the Invention of "IMPROVEMENTS IN THE
MANUFACTURE OF ASPHALT OR COMPOSITION ADAPTED FOR PAVING AND OTHER
SIMILAR UBES."
Sealed the 19th April 1872, and dated the 12th December 1871.
C
PROVISIONAL SPECIFICATION left by the said George Evans at the
Office of the Commissioners of Patents, with his Petition, on the
12th December 1871.
I, GEORGE EVANS, of Norwich, in the County of Norfolk, Gas
Manager, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN THE MANUFACTURE OF ASPHALT OR COMPOSITION (ADAPTED
FOR PAVING AND OTHER SIMILAR USES," to be as follows:-
My Invention consists in the manufacture of a composition containing
the following ingredients, in the following proportions by bulk, that is to
say, eight parts of clinker, three parts and a half of sand, two parts of
lime, two parts of shingle, and three parts of tar.

page_text: Under certain conditions breeze must be added in the proportion of
one part and a half, in order to produce by the burning of the breeze
the heat required to carry on the process of manufacture.
In the preparation of the asphalt or composition the clinker is
crushed and afterwards heated to a red heat (either by the use of breeze
or otherwise) in order thoroughly to expel any moisture that may exist
in the above named ingredients with which the clinker is incorporated.
The heating of the clinker to a red heat may be performed in an oven or
retort, in which case the breeze may be dispensed with, and the operation
of drying the remaining ingredients, except the tar, be carried on
independently, their mixture and incorporation with the burnt clinker
being effected on the removal of the clinker from the oven or retort. Or
the burning of the crushed clinker and the drying of the other ingredients
may be effected by burning in the open air in the manner in which
ballast is sometimes burned. The tar is afterwards added and the whole
mass is again thoroughly mixed.
The above stated proportions of the ingredients would be maintained
in all cases of heavy traffic or wear, but for footpaths and surfaces
subject only to light traffic the shingle would be used in larger pro-
portion and the clinker in smaller.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said George Evans in the Great Seal Patent Office on
the 11th June 1872.
TO ALL TO WHOM THESE PRESENTS SHALL COME, T, GEORGE
EVANS, of Norwich, in the County of Norfolk, Gas Manager, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twelfth day of December, in the
year of our Lord One thousand eight hundred and seventy-one, in the
thirty-fifth year of Her reign, did, for Herself, Her heirs and succes-;
sors, give and grant unto me, the said George Evans, Her special
licence that I, the said George Evans, my executors, administrators,
and assigns, or such others as I, the said George Evans, my executors,
alministrators, and assigns, should at any time agree with, and uc

page_text: 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
3 IN THE MANUFACTURE OF ASPHALT OR COMPOSITION ADAPTED FOR PAVING AND
OTHER SIMILAR USES," upon the condition (amongst others) that I, the
said George Evans, my exccutors or administrators, by an instrument in
writing under my, or their, or one of their hands and scals, 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 George Evans, do hereby declare
the nature of the 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 :—
My Invention of "Improvements in the Manufacture of Asphalt or
Composition Adapted for Paving and other similar Uses" consists in
the manufacture of a composition containing the following ingredients,
in or about the following proportions by bulk, that is to say, eight parts
of clinker, slag, refuse from iron stone, or any kind of metallic refuse
from furnaces, three parts and a half of sand, two parts of lime, two
parts of shingle, and three parts of tar reduced to pitch. Under
certain conditions breeze must be added in the proportion of one part
and a half, in order to produce by the burning of the breeze the heat
required to carry on the process of manufacture.
In the preparation of the asphalt or composition the clinker, slag, or
metallic refuse is crushed as required, and afterwards heated to a red
heat. This heating may be performed in an oven or retort, in which case
the breeze may be dispensed with, and the operation of drying the
remaining ingredients, except the tar or pitch, carried on independently,
their mixture and incorporation with the burnt clinker or metallic refuse
being effected on the removal of the clinker or metallic refuse from the
oven or retort. Or the burning of the crushed clinker or metallic refuse
and the drying of the other ingredients may be effected by burning in the
open air in the manner in which ballast is sometimes burned. The lime

page_text: is added to the said ingredients and thoroughly mixed with them, when
the tar or pitch is added and the whole mass again thoroughly mixed.
The above stated proportions of the ingredients are employed in
making an asphalt adapted for all cases of heavy traffic or wear, but for
foot paths and surfaces subject only to light traffic the shingle is or may
be used in larger proportions, and the clinker or metallic refuse in
smaller.
Having thus described the nature of the said Invention, and in what
manner the same is to be performed, I hereby declare that what I claim
as of my Invention is,—
The manufacture of asphalt or composition of the materials or.
ingredients used in the proportions herein-before stated or thereabouts,
that is to say, eight parts of clinker, slag, refuse from iron stone, or
any kind of metallic refuse from furnaces, three parts and a half of
sand, two parts of lime, two parts of shingle, and three parts of tar
reduced to pitch.
In witness whereof, I, the said George Evans, have hereunto set my
hand and seal, the Eighth day June, in the year of our Lord
One thousand eight hundred and seventy-two.
Witness,
JOSEPH B. BROWN,
of the City of Norwich,
in the County of Norfolk,
Schoolmaster.
GEORGE EVANS.
(L.S.)
of the City of Norwich,
in the County of Norfolk,
Gas Manager.