IMPROVEMENTS IN THE MANUFACTURE OF BRICKS FOR BUILDING AND OTHER PURPOSES
Year: 1880

page_text: LETTERS PATENT to Frank Wirth, of the Firm of Wirth and Company, Patent
Solicitors, at Frankfort-on-the-Main, in the Empire of Germany, for an
Invention of "IMPROVEMENTS IN THE MANUFACTURE OF BRICKS FOR BUILDING
AND OTHER PURPOSES." A communication from Carl Grünzweig, Doctor of
Philosophy, and Paul Hartmann, persons trading under the Firm of
Grünzweig & Hartmann, resident at Ludwigshafen-on-the-Rhine, in the
Empire of Gerinany.
PROVISIONAL SPECIFICATION left by the said Frank Wirth at the Office
of the Commissioners of Patents on the 16th November 1880.
FRANK WIRTH, of the Firm of Wirth and Company, Patent Solicitors, at Frankfort
on the Main, in the Empire of Germany. "IMPROVEMENTS IN THE MANUFACTURE
OF BRICKS FOR BUILDING AND OTHER PURPOSES." A communication from
Carl Grünzweig, Doctor of Philosophy, and Paul Hartmann, persons trading under
the Firm of Grünzweig and Hartmann, resident at Ludwigshafen on the Rhine, in
the Empire of Germany.
This Invention relates to the manufacture of a light and firm brick suitable for
all kinds of work where strength and lightness are required, such as for partitions
in upper stories where the support of a lower wall is wanting, and wherever these
qualities are a consideration.
Whereas bricks hitherto employed for such purposes bave either been of
considerable weight, or where sawdust and shavings in combination with a binding
material have been employed for the sake of lightness have been liable to rot and
decay, now this Invention obviates these disadvantages and produces a brick which
light and at the same time without tendency to decay.
The materials employed in the manufacture of these bricks are cork wood,
reduced by any suitable means, cement, sand, clay, hydrate of lime, soluble glass,
hair or other suitable fibre, and a sufficient quantity of water mixed with the mass

page_text: to render it plastic and easy to mould. The bricks are formed and pressed in the
usual manner and finished by drying in the air.
It is preferred to mix the reduced cork wood with a mixture composed of the
clay, hydrate of lime, soluble glass, and a small quantity of the hair or fibre.
The clay serves to prevent severance of the lime from the cork; the soluble glass
serves chiefly to protect the various components from damp and thus from decay,
as also to form lime silicates which add to the strength of the brick; the hair or
other suitable fibre binds the materials when drying.
The proportions I prefer to employ are:-
8
parts by weight of pulverized cork,
3
91/2
112
"
"
"
"
"
"
دو
"
"
"
"
"
clay, sand, &c.,
hydrate of lime,
soluble glass,
a suitable quantity of hair and fibre for binding purposes, and sufficient water to
render the mass plastic and workable.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Frank Wirth in the Great Seal Patent Office on the 16th May
1881.
28
FRANK WIRTH, of the Firm of Wirth and Company, Patent Solicitors, at Frankfort
on the Main, in the Empire of Germany. IMPROVEMENTS IN THE MANUFACTURE
OF BRICKS FOR BUILDING AND OTHER PURPOSES." A communication from
Carl Grünzweig, Doctor of Philosophy, and Paul Hartman, persons trading under
the Firm of Grünzweig and Hartman, resident at Ludwigshafen on the Rhine,
in the Empire of Germany.
This Invention relates to the manufacture of a light and firm brick suitable for
all kinds of work where strength and lightness are required, such as for partitions
in upper stories where the support of a lower wall is wanting, and wherever these
qualities are a consideration.
Whereas bricks hitherto employed for such purposes have either been of
considerable weight, or where sawdust and shavings in combination with a binding
material have been employed for the sake of lightness have been liable to rot and
decay, now this Invention obviates these disadvantages and produces a brick which
is light and at the same time without tendency to decay.
The materials employed in the manufacture of these bricks are cork wood,
reduced by any suitable means, cement, sand, clay, hydrate of lime, soluble glass,
hair or other suitable fibre, and a sufficient quantity of water mixed with the mass
to render it plastic and easy to mould. The bricks are formed and pressed in the
usual manner and finished by drying in the air.
It is preferred to mix the reduced cork wood with a mixture composed of the
clay, hydrate of lime, soluble glass and a small quantity of the hair or fibre.
The clay serves to prevent severance of the lime from the cork; the soluble glass
serves chiefly to protect the various components from damp and thus from decay,
as also to form lime silicates which add to the strength of the brick; the hair
or other suitable fibre binds the materials when drying.
The proportions I prefer to employ are eight parts by weight of pulverized cork,
91, parts by weight of clay, sand, &c., three parts by weight of hydrate of lime, one
and a half parts by weight soluble glass, a suitable quantity of hair and fibre for
binding purposes, and sufficient water to render the mass plastic and workable.
And having now fully described and ascertained the nature and object of the
Invention communicated to me by my correspondent, be it known that what
I claim as novel and useful and desire to protect by my said Letters Patent is,―
The improvements in the manufacture of bricks for building and other purposes,
substantially in the manner and for the purposes as herein before specified.
In witness whereof, I, the said Frank Wirth, have hereunto set my hand and
seal, this Twelfth day of April, in the year of our Lord One thousand
eight hundred and eighty one.
FRANK WIRTH. (L.S.)