IMPROVEMENTS IN THE MANUFACTURE OF BASIC FIRE BRICKS
Year: 1880

page_text: LETTERS PATENT to Isidor Furstenhagen, of Bradford, in the County of York,
Agent, for an Invention of "IMPROVEMENTS IN THE MANUFACTURE OF BASIC
FIRE BRICKS." A communication from abroad by Ludwig Haarmann, Engineer,
of Hanover, in the Empire of Germany.
PROVISIONAL SPECIFICATION left by the said Isidor Furstenhagen at the
Office of the Commissioners of Patents on the 1st January 1880.
ISIDOR FURSTENHAGEN, of Bradford, in the County of York, Agent. "IMPROVE-
MENTS IN THE MANUFACTURE OF BASIC FIRE BRICKS." [A communication from
abroad by Ludwig Haarmann, Engineer, of Hanover, in the Empire of Germany.]
This Invention has for its object a new or improved process of manufacturing
basic fire bricks by the aid of dolomite and milk of lime.
The dolomite is first ground in its raw unburnt state, and thoroughly well mixed
with milk of lime in such proportions that the mixture contains, say, from 90 to 98
parts of dolomite and 10 to 2 parts of quicklime.
Out of that product bricks are formed and kilned under a high temperature.
The chemical action which then takes place effects an amalgamation of the
quicklime with the silica, a small per-centage of which is always contained in the
dolomite, whereby silicated lime is produced, which acts as a binding medium to
the particles of the dolomite.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Isidor Furstenhagen in the Great Seal Patent Office on the 30th
June 1880.
ISIDOR FURSTENHAGEN, of Bradford, in the County of York, Agent. "IMPROVE-
MENTS IN THE MANUFACTURE OF BASIC FIRE BRICKS." A communication from
abroad by Ludwig Haarmann, Engineer, of Hanover, in the Empire of Germany.
This Invention has for its object "Improvements in the Manufacture of Basic
Fire Bricks," and consists in a new or improved process of manufacturing such
bricks from a mixture of dolomite and milk of lime.
Such improved process is carried out in the following manner :-
The dolomite is first ground in its raw unburnt state, and thoroughly well mixed
with milk of lime in such proportions that the mixture contains from 90 to 98 parts
of dolomite, and from 10 to 2 parts of quicklime.
Out of this product the bricks are formed and kilned under a high temperature.
The chemical action which ensues effects an amalgamation of the quicklime with
the silica, a small percentage of which is always contained in the dolomite, whereby
silicated lime is produced, which acts as a binding medium to the particles of the
dolomite.
Having thus described the nature of the said Invention, as communicated to me
as aforesaid, I would have it understood that I claim as the Invention the subject
matter of the hereinbefore in part recited Letters Patent, the new and improved
process of manufacturing basic fire bricks from a mixture of ground dolomite and
milk of lime mixed together in the proportions hereinbefore mentioned and then
burning the same under a high temperature, as herein before described.
In witness whereof, I, the said Isidor Furstenhagen, have hereunto set my
hand and seal, this Twenty eighth day of June, in the year of our Lord One
thousand eight hundred and eighty.
ISIDOR FURSTENHAGEN.
(L.S.)