AN IMPROVED MANUFACTURE OF BRICKS, TILES, SLABS, AND BLOCKS OF BUILDING MATERIAL
Year: 1883

page_text: LETTERS PATENT to John Caldwell Bloomfield of N° 261 Cornwall Road
Nottinghill in the County of Middlesex for an Invention of "AN IMPROVED
MANUFACTURE OF BRICKS, TILES, SLABS, AND BLOCKS OF BUILDING MATERIAL
PROVISIONAL SPECIFICATION left by the said John Caldwell Bloomfield
at the Office of the Commissioners of Patents on the 7th September 1883.
JOHN CALDWELL BLOOMFIELD of N° 261 Cornwall Road, Nottinghill in the
County of Middlesex "AN IMPROVED MANUFACTURE OF BRICKS, TILES SLABS,
AND BLOCKS OF BUILDING MATERIAL."
My invention relates to the manufacture of bricks, tiles slabs or blocks of other
forms available as sound, strong and watertight building material. For this
purpose I melt gas pitch and intimately mix with it about an equal volume of
powdered chalk, and I add either sand or burnt ballast until the mixture becomes
so thick that it can scarcely be stirred. I pour this mixture into moulds, and when
it has set, I remove from the moulds the bricks slabs or blocks of the shapes and
dimensions required. Instead of first mixing the chalk with the pitch and
afterwards adding the sand or ballast, the chalk may, in the first place, be mixed
with the sand or ballast and the whole added to the molten pitch. When blocks of
great weight are required to be used as weights for effecting counterbalance or
producing pressure or for ballasting vessels, I employ instead of the chalk and sand
or ballast, powdered crude barytes. When it is desired to produce the bricks or
other articles with a glazed surface, I leave a little depth of the mould unfilled in
the first instance, and before the material sets therein, I pour over it a mixture of
molten pitch and powdered chalk or powdered flint in about equal proportions by
measure.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said John Caldwell Bloomfield in the Patent Office on the 7th March
1884.
JOHN CALDWELL BLOOMFIELD of No: 261 Cornwall Road, Nottinghill in the
county of Middlesex "AN IMPROVED MANUFACTURE OF BRICKS, TILES, SLABS,
AND BLOCKS OF BUILDING MATERIAL
"
My invention relates to the manufacture of bricks, tiles, slabs, or blocks of other
forms available as sound, strong and watertight building material. For this
purpose, I melt gas pitch and intimately mix with it about an equal volume of
powdered chalk, and I add either sand or burnt ballast until the mixture becomes
so thick that can scarcely be stirred. I pour this mixture into moulds, and when
it has set, I remove from the moulds the bricks, slabs or blocks of the shapes and
dimensions required. Instead of first mixing the chalk with the pitch and
afterwards adding the sand or ballast, the chalk may, in the first place, be mixed
with the sand or ballast, and the whole added to the molten pitch. When blocks
of great weight are required to be used as weights for effecting counterbalance or
producing pressure, or for ballasting vessels, I employ, instead of the chalk and
sand or ballast, powdered crude barytes. When it is desired to produce the bricks
or other articles with a glazed surface, I leave a little depth of the mould unfilled
in the first instance, and, before the material sets therein, I pour over it a mixture
of molten pitch and powdered chalk or powdered flint in about equal proportions
by measure.
Instead of casting bricks, blocks or slabs, as above described, separately,
and then using them for structures, the material may be applied for grouting
or facing structures already made. In making blocks or slabs, the mould may
be partly filled with rough bricks or pieces of bricks, fragments of stone or
flint, the molten mixture being poured in so as to fill up the interstices and bind
the pieces together. Thus, for example, a certain height of wall may be built in
dry bricks or stones, and then the mixture of gas pitch and chalk may be poured
into the interstices for the purpose of grouting, or between the face of the structure
and a plate fixed at a little distance it so as to form a facing of of impervious
material, part of which, running into the interstices, makes firm and solid work.
In like manner, earthenware pipes may be jointed together by the mixture poured
into their sockets or into separable socket moulds.
Having thus described the nature of my invention and in what manner the same
is to be performed I claim :-
The manufacture of bricks, tiles, slabs and blocks of building material, by
moulding a molten mixture of gas pitch, powdered chalk, and other material,
substantially as herein described
In Witness whereof I the said John Caldwell Bloomfield have hereunto set my
hand and seal this Twenty ninth day of February in the year of our Lord, one
thousand, eight hundred and eighty-four.
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