Improvement in the Construction and Manufacture of Filtering Material.
Year: 1895

page_text: Date of Application, 5th June, 1895
Complete Specification Left, 5th Mar., 1896-Accepted, 18th Apr., 1896
PROVISIONAL SPECIFICATION.
Improvement in the Construction and Manufacture of Filtering
Material.
ALFRED SMITH 6 Alderton Road Camberwell S.E. Engineer do hereby declare
the nature of this invention to be as follows:-
This invention has for its object the improvement in the construction and
manufacture of filtering blocks or plates of carbonized material used for purifying
water in such a manner as to render such blocks or plates germ proof. Hitherto
such blocks or plates have been composed of charcoal or other materials the
particles being of the same or about the same size throughout mixed with pitch
tar resin or other similar materials to bind the particles together, pressed in moulds,
and subjected to great heat in a retort or kiln to burn out the pitch tar or other
similar materials, and the pores or spaces between the particles composing such
blocks or plates not being sufficiently small to prevent any disease or other germs
present in water filtered through them passing through with the filtrate such blocks
or plates do not effect perfect filtration or sterilization.
My improvement consists of making filtering blocks or plates the interior con-
sisting of coarse material and the exterior being composed of a thin coating of charcoal
or other suitable material sufficiently fine to arrest any disease or other germs that
may be in the water to be passed through them and prevent their passing through
with the filtrate, thereby rendering the filtrate perfectly pure and sterile, such fine
coating being the actual filtering medium, the coarse-interior forming the foundation
for its support and to enable it to withstand pressure.
Dated this Fifth day of June 1895.
Improvement in the Construction and Manufacture of Filtering
Material.
ALFRED SMITH 6 Alderton Road Camberwell S.E. Engineer do hereby declare
the nature of this invention and in what manner the same is to be performed,
to be particularly described and ascertained in and by the following statement :—
This invention has for its object the improvement in the construction and
manufacture of filtering blocks or plates of carbonized materials used for purifying
water, in such a manner as to render them germ proof. Hitherto such blocks or
plates have been composed of charcoal or other materials, the particles being the
same or about the same size, mixed with pitch tar resin or other suitable material
to bind the particles together, pressed in moulds and subjected to great heat in
retorts or kilns to burn out the pitch tar resin or other binding materials, and the
pores or spaces between the particles composing such blocks or plates not being
sufficiently small to prevent any disease or other gerins present in water filtered
through such blocks or plates passing through with the filtrate, such blocks or
plates do not effect perfect filtration or sterilization.

page_text: My improvement consists of making filtering blocks or plates the interior con-
sisting of coarse material and the exterior being composed of a thin coating of charcoal
or other suitable material sufficiently fine in grain or texture to arrest any disease
or other germs that may be in the water passing through with the filtrate, thereby
rendering any water passed through such blocks or plates perfectly pure and sterile,
the thin coating of finely divided material forming the actual filtering medium, the
coarse interior forming the foundation for its support and to enable it to withstand
pressure.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. The construction and manufacture of filtering blocks or plates of any desired
shape and size, in which the interior consists of coarse material with an outer
coating or layer of material of any desired degree of fineness, substantially as herein
described.