IMPROVEMENTS IN THE MANUFACTURE OF PORTLAND CEMENT
Year: 1877

page_text: LETTERS PATENT to Henry Reid, of Bexley Heath, in the County of Kent,
Civil Engineer, and William Sunith, of 27, Waterloo Road, in the City of Dublin,
Civil Engineer, for the Invention of "IMPROVEMENTS IN THE MANUFACTURE
OF PORTLAND CEMENT."
Sealed the 4th December 1877, and dated the 6th June 1877.
PROVISIONAL SPECIFICATION left by the said Henry Reid and William
Smith at the Office of the Commissioners of Patents on the 6th June 1877.
HENRY REID, of Bexley Heath, in the County of Kent, Civil Engineer, and
WILLIAM SMITH, of 27, Waterloo Road, in the City of Dublin, Civil Engineer.
"IMPROVEMENTS IN THE MANUFACTURE OF PORTLAND CEMENT."
This Invention consists in the conversion of the "calp" limestone of Ireland into
Portland cement by the following process:-The stone is selected from the quarry
of the required analysis, and, after being dried, is finely ground so that it will pass
through a sieve of at least a thousand meshes to the square inch. The powder is
then made into bricks by a pressing machine under great pressure. When suffi-
ciently dried, the bricks are put into any kind of suitable kiln and burnt; coke, coal,
or other similar fuel being used for the purpose.
After calcination, the resulting products from the kiln are crushed and ground,
producing a powder of the required quality of the best kind of Portland cement.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Henry Reid and William Smith in the Great Seal Patent Office
on the 6th December 1877.
HENRY REID, of Bexley Heath, in the County of Kent, Civil Engineer, and
WILLIAM SMITH, of 27, Waterloo Road, in the City of Dublin, Civil Engineer.
"IMPROVEMENTS IN THE MANUFACTURE OF PORTLAND CEMENT."
This Invention consists in, and has for its object, improvements in the manu-
facture of Portland cement (as described in our Provisional Specification) which is
as follows:-We convert the "calp" limestone of Ireland into Portland cement by
the following process. The stone is selected from the quarry of the required analysis,
and, after being dried, is finally ground so that it will pass through a sieve of at
least a thousand meshes to the square inch. The powder is then made into bricks
by a pressing machine under great pressure. When sufficiently dried, the bricks
are put into any kind of suitable kiln and burnt; coke, coal, or other similar fuel
being used for the purpose.
After calcination, the resulting products from the kiln are crushed and ground,
producing a powder of the required quality of the best kind of Portland cement.
Having now described the nature of our said Invention and in what manner the
same is be performed, we would observe in conclusion that what we consider to be
novel and original, and therefore claim as constituting the Invention secured to us
by the said herein-before in part recited 'Letters Patent is, the conversion of the
calp" limestone of Ireland into Portland cement, as herein-before described.
In witness whereof, I, the said Henry Reid, have hereunto set my hand and
seal, this Sixth day of December, in the year of our Lord One thousand eight
hundred and seventy-seven.