Improvements connected with the Manufacture of White Lead.
Year: 1891

page_text: Date of Application, 11th Nov., 1891
Complete Specification Left, 10th Aug., 1892-Accepted. 17th Sept., 1892
PROVISIONAL SPECIFICATION.
Improvements connected with the Manufacture of White Lead.
I, EDWARD VINCENT GARDNER, of Tremont, Florence Road, New Cross,
London, S.E., Professor of Chemistry, do hereby declare the nature of this
invention to be as follows:-
This invention has reference to the production of blue lead sheets for use in the
production of white lead, and has for its object to provide a large surface of metal
on which the corroding gases and vapours used in the manufacture of white lead
may act, with a minimum mass or weight; and it has, at the same time, for its
object to produce such sheets in such a form that they will bear handling and
manipulation by ordinary workmen, without unusual care, and stand firmly upright
in packing. A yet further object is to provide sheets or plates as free from fibrous
structure as possible, and possessing a good crystaling surface, and yet of regular
substance.
To these ends, and according to my invention, I provide corrugated or embossed
thin lead plates, say of 1 of an inch, or under. In some cases the corrugations
may run longitudinally and laterally or crosswise, whereby strength is imparted to
the plate in all directions, and it is thus enabled to be handled-by its strength so
provided without unusual care, and will stand of itself upright.
The corrugated plates or sheets, as above described, are produced by casting
thin sheets of lead, and subsequently pressing them into the corrugated form. This
may be done, in some cases, by passing the sheets or plates through corrugated
rolls, say first in one direction and then in another. In such a case the plate would
be doubly corrugated and thus form an embossed plate exposing a large surface.
In lieu of making the plates in the above manner, they may be produced by casting
them in the desired form.
These lead plates constructed as herein described will be corroded in the corroding
chamber, within a relatively short space of time. After they are corroded and
taken out of the chamber, the white lead is removed by passing them through a
squeezing roller or mill, or in any convenient way. The plates may be packed in
the chamber in any suitable way, and different suitable means of producing them
may be employed in carrying out the invention.
Dated this 10th day of November 1891
CHEESBROUGH & ROYSTON, Fels. Chart. Inst. P.A.,
15, Water Street, Liverpool, Applicant's Patent Agents.
COMPLETE SPECIFICATION.
Improvements connected with the Manufacture of White Lead.
I, EDWARD VINCENT GARDNER, of Tremont, Florence Road, New Cross,
London, S.E., Professor of Chemistry, 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 reference to the production of blue lead sheets for use in the
production of white lead, and has for its object to provide a large surface of metal
in a small space on which the corroding gases and vapours used in the manufacture
of white lead may act, with a minimum mass or weight; and it has, at the same
time, for its object to produce such sheets in such a form that they will bear
handling and manipulation by ordinary workmen, without unusual care, and stand
firmly upright in packing. A yet further object is to provide sheets or plates as

page_text: free from fibrous structure as possible, and possessing a good crystaline surface,
and yet of regular substance.
To these ends, and according to my invention, I provide corrugated or doubly
corrugated or embossed thin lead plates, say of 16 of an inch, or under. In some
cases the corrugations may run longitudinally and laterally or diagonally, or cross-
wise, whereby a greater surface in a given space is obtained, while at the same
time strength is imparted to the plate in all directions, and it is thus enabled to be
handled by its strength so provided-without unusual care, and will stand of itself
securely, upright, when packed and in packing in the chamber.
The corrugated plates or sheets, as above described, are produced by casting
thin sheets of lead, and subsequently pressing them into the corrugated form. This
may be done, in some cases, by passing the sheets or plates through corrugated
rolls, say first in one direction and then in another. In such a case the plate
would be doubly corrugated and thus form an embossed plate exposing a large
surface. In lieu of making the plates in the above manner, they may be produced
by casting them in the desired form; or by dies and presses-acting on sheets
of lead.
These lead plates, constructed as herein described, will be corroded in the
corroding chamber, within a relatively short space of time. After they are corroded
and taken out of the chamber, the white lead is removed by passing them through
a'squeezing roller or mill, or in any convenient way. The plates may be packed
in the chamber in any suitable way, and different suitable means of producing them
may be employed in carrying out the invention.
In the drawings which serve to illustrate my invention I show, in Figure 1, a
plate constructed in accordance therewith, in cross section; while Figure 2 shows
the plate in plan.
Figure 3 is a detail showing the transverse corrugations in section.
Figure 1 shows what may be termed the longitudinal corrugations, in section ;
these, in the example of plate given, being the main corrugations. The transverse
corrugations or indentations formed on the main or longitudinal corrugations are
designated a, one row of which, riz., those in the upper part of the main cor-
rugations of the plate, is shown in section in Figure 3.
This construction it will be seen provides strength in all directions, and enables
the plate to be handled without breaking, even when very thin; and it will stand
without breaking or bending, when stowed in the chamber in which it may be
treated.
As above stated, plates according to my invention may be made by suitably
indenting or embossing them, in any way to produce effects similar or equivalent to
the corrugations, and so that they are rendered strong, and enabled to be used thin;
and providing also at the same time a large area relatively with the space
occupied.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed 1 declare that what I
claim is :-
The herein described improvement connected with the manufacture of white lead
from blue lead, that is to say, the production or employment of blue lead sheets of
corrugated, embossed, or indented construction or form, substantially as herein set
forth, and for the purposes specified.
th day of August 1892.
CHEESBROUGH & ROYSTON, Fels. Chart. Inst. P.A.,
15, Water Street, Liverpool, Applicant's Patent Agents.