Improvements in the Manufacture of White Lead.
Year: 1896

page_text: Date of Application, 30th June, 1896
Complete Specification Left, 25th Mar., 1897-Accepted, 15th May, 1897
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of White Lead.
We, HARRY CARRICK WEBSTER, of the Firm of Alexander Fergusson and
Company, of 38 McAlpine Street, in the County of Glasgow, North Britain,
Lead and Color Manufacturers, and ROBERT CRAWFORD, of the same place,
Foreman, do hereby declare the nature of this invention to be as follows that is
to say:-
This invention relates to what is known as the Dutch process for making white
lead, in which process, upon a layer of spent tan bark earthenware pots are
arranged and have put in them suitable quantities of dilute acetic acid, the lead to
be acted on being placed upon or both within and upon the pots. A number of
the pots are larger than the others and support boards upon which another layer
of bark is placed, another series of pots being placed thereon. In a similar way
several tiers or heights (sometimes called heats) are formed one above the other
and form a stack. The handling of the pots involves considerable loss from
breakages and otherwise; and the object of this invention is to avoid such losses,
and at the same time to obtain better results from a stack of a given size.
The invention consists in substituting lead pots or vessels for some or all the
smaller pots, earthenware pots of the larger size being retained for supporting the
boards of each upper tier, or any other suitable and convenient support being
provided for that purpose. The lead pots may be shaped the earthenware pots
hitherto used; or any other suitable form of lead vessel may be substituted, such
for example as trays with or without compartment partitions, the vessels requiring
to have raised sides to retain the quantities of dilute acetic acid for acting on the
lead. As with the pots hitherto in use, lead in any suitable form is to be arranged
upon or upon and within the lead pots or vessels, and the white-lead-forming action
takes place not only upon such superimposed lead but also upon the lead of the pots
or vessels themselves.
Dated this Twenty-ninth day of June 1896.
EDMUND HUNT,
Applicants' Agent.
Improvements in the Manufacture of White Lead.
We, HARRY CARRICK WEBSTER, of the Firm of Alexander Fergusson and
Company, of 38 McAlpine Street, in the County of Glasgow, North Britain,
Lead and Color Manufacturers, and ROBERT CRAWFORD of the same place,
Foreman, 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, that is to say :-
This invention relates to what is known as the Dutch process for making white

page_text: lead, in which process, upon a layer of spent tan bark earthenware pots are
arranged, and have put in them suitable quantities of dilute acetic acid the lead to
be acted upon being placed upon or both within and upon the pots. A number of
the pots are larger than the others and support boards upon which another layer
of bark is placed, another series of pots being placed thereon. In a similar way
several tiers or heights (sometimes called heats) are formed one above the other
and form a stack. The handling of the pots involves considerable loss from
breakages and otherwise and the object of this invention is to avoid such losses and
at the same time to obtain better results from a stack of given size..
The invention consists in substituting lead pots or vessels for some or all of the
earthenware pots. The lead pots may be shaped like the. earthenware pots
hitherto used, or any other suitable form of lead vessel may be substituted such
for example as trays with or without compartment partitions, the vessels requiring
to have raised sides to retain the quantities of dilute acetic acid for acting on the
lead. As with the pots hitherto in use lead in any suitable form is to be arranged
upon or upon and within the lead pots or vessels, and the white-lead-forming action'
takes place not only upon such superimposed lead but also upon the lead of the pots
or vessels themselves."
The thickness of the lead forming the pots may be varied, but a thickness of
about an eighth of an inch has been found convenient in practice.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
In the manufacture of white lead by the Dutch process substituting lead pots or
.vessels for some or all of the earthenware pots hitherto employed substantially as
hereinbefore described.
Dated this Twenty-fourth day of March 1897.
EDMUND HUNT,
Applicants' Agent.