An Improvement in White Lead Cans.
Year: 1894

page_text: Date of Application, 14th Mar., 1894
Complete Specification Left, 6th Dec., 1894-Accepted, 12th Jan.,
1895
An Improvement in White Lead Cans.
I, GUSTAV BISCHOF, of No. 4 Hart Street, Bloomsbury, in the County of
London, Professor of Chemistry, do hereby declare the nature of this invention to
be as follows:-
The cans containing white lead paste being seldom quite filled, the upper surface
of the material is exposed to air and becomes covered with a yellowish crust which
on account of its objectionable colour and consistence must be removed otherwise
the whole of the material in the can is more or less damaged. My invention
relates to means of preventing the formation of this objectionable crust, which I
effect in the following manner.
In each can, when it is charged with its proper weight of paste, I place a plate
of sheet metal which has been pressed into the form of a spherical segment.
By pushing this plate with its convex side downwards down into the material I
cause the air to escape and the paste to rise along the sides of the can so as to fill up
completely all the space under the plate. The plate is provided on its concave or
upper side with hooks or handles by which it can be removed and these being
flexible, are bent to such form that when the lid of the can is put on, it bears on
them and so holds the plate down upon the paste.
The plate instead of being of metal may be of earthenware, papier-maché or
other material that can retain its shape, and instead of being spherically curved it
may be conical or conoidal.
Dated this 14th day of March 1804
ABEL & IMRAY,
Agents for the Applicant.
An Improvement in White Lead Cans.
I, GUSTAV BISCHOF, of No. 4 Hart Street, Bloomsbury, in the County of
London, 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 :-
The cans containing white lead paste being seldom quite filled, the upper surface
of the material is exposed to air, and becomes covered with a yellowish crust which
on account of its objectionable colour and consistence must be removed otherwise
the whole of the material in the can is more or less damaged.
My invention relates to means of preventing the formation of this objectionable
crust, which I effect in the following manner.
In each can, when it is charged with its proper weight of paste, I place a plate
of sheet metal such as tin plate which has been pressed into the form of a spherical
segment.
By pushing this plate with its convex side downwards down into the material I
cause the air to escape and the paste to rise along the sides of the can so as to fill
up completely all the space under the plate.

page_text: The plate is provided on its concave or upper side with hooks or handles by
which it can be removed and these being flexible, are bent to such form that when
the lid of the can is put on, it bears on them and so holds the plate down upon the
paste.
The plate instead of being of metal may be of earthenware, papier maché or
other material that can retain its shape and is not acted on by the paste and instead
of being spherically curved it may be conical or conoidal.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
In combination with a white lead can, an internal cover, substantially as and for
the purpose set forth.
Dated this 6th day of December 1894.
ABEL & IMRAY,
Agents for the Applicant.