IMPROVEMENTS IN THE D. AW UR TO HEAT OR STRAIN
Year: 1875

page_text: LETTERS PATENT to Manning Prentice, of Stowmarket, in the
County of Suffolk, for the Invention of "IMPROVEMENTS IN THE
D. AW UR
TO HEAT OR STRAIN"
Sealed the 2nd June 1876, and dated the 18th December 1875.
PROVISIONAL SPECIFICATION left by the said Manning Prentice at
the Office of the Commissioners of Patents, with his Petition, on
the 18th December 1875.
I, MANNING PRENTICE, of Stowmarket, in the County of Suffolk, do
5 hereby declare the nature of the said Invention for "IMPROVEMENTS IN
THE CONSTRUCTION OF PLATINUM VESSELS EXPOSED TO HEAT OR STRAIN," to be
as follows:-
The platinum vessels employed in chemical operations, as in the con-
centration of sulphuric acid and in the treatment of other corrosive
▸ substances, are very expensive; their surfaces when exposed to the
action of fire become damaged and can only be repaired or replaced at
great cost. Moreover when platinum surfaces of considerable extent
are exposed to pressure or other strains they must be made thick and

page_text: heavy and are therefore very costly. The object of my Invention is to
protect and strengthen such platinum surfaces at moderate cost and in
such a manner that when the exposed surface becomes damaged it can
be cheaply and easily replaced, and also that a considerable portion of
the material now employed in constructing such vessels can be replaced
by material of less cost. For this purpose in constructing such platinum
vessels I plate the surface that is to be exposed to heat with copper or
other comparatively cheap metal, using by preference the electro-plating
process, which may be applied either to the sheet platinum used for
constructing the vessel, or to the vessel after it has been made. When
this plating has become damaged or deteriorated it can be replaced by
fresh electroplating, the protected platinum remaining entire and
undamaged.
When considerable strength is required the plating may be made
proportionately thick, the platinum constituting merely a thin lining to
protect the more corrosible metal from the action of the materials
treated. I am aware that vessels have been constructed of copper
plated internally with platinum by depositing the latter upon the
former, but it has been found difficult to obtain a sound and regular
coating.
By the means which I have described I secure in the first place a
sound platinum surface or lining, and then I strengthen and protect it
by depositing thereon the other metal, the soundness of which is of less
importance.
SPECIFICATION in pursuance of the conditions of the Letters Patent, 2
filed by the said Manning Prentice in the Great Seal Patent
Office on the 17th June 1876.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, MANNING.
PRENTICE, of Stowmarket, in the County of Suffolk, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her 3
Letters Patent, bearing date the Eighteenth day of December, in the
year of our Lord One thousand eight hundred and seventy-five, in
the thirty-ninth year of Her reign, did, for Herself, Her heirs and suc-
cessors, give and grant unto me, the said Manning. Prentice, Her

page_text: special license that I, the said Manning Prentice, my executors,
administrators, and assigns, or such others as I, the said Manning
Prentice, my executors, administrators, and assigns, should at any time
agree with, and no others, from time to time and at all times there-
after during the term therein expressed, should and lawfully might.
make, use, exercise, and vend, within the United Kingdom of Great
Britain and Ireland, the Channel Islands, and Isle of Man, an Inven-
tion for "IMPROVEMENTS IN THE CONSTRUCTION OF PLATINUM VESSELS EXPOSED.
TO HEAT OR STRAIN," upon the condition (amongst others) that I, the
said Manning Prentice, my executors or administrators, by an instru-,
ment in writing under my, or their, or one of their hands and seals,
should particularly describe and ascertain the nature of the said
Invention, and in what manner the same was to be performed, and
cause the same to be filed in the Great Seal Patent Office within six
calendar months next and immediately after the date of the said
Letters Patent.
NOW KNOW YE, that I, the said Manning Prentice, do hereby
declare the nature of the said Invention, and in what manner tho
same is to be performed, to be particularly described and ascertained
in and by the following statement thereof, that is to say:―
The platinum vessels employed in chemical operations, as in the con-
centration of sulphuric acid and in the treatment of other corrosive
substances, are very expensive; their surfaces when exposed to the
action of fire become damaged and can only be repaired or replaced at
great cost. Moreover when platinum surfaces of considerable extent
are exposed to pressure or other strains they must be made thick and
heavy, and are therefore very costly. The object of my Invention is to
protect and strengthen such platinum surfaces at moderate cost, and in
such a manner that when the exposed surface becomes damaged it can
be cheaply and easily replaced, and also that a considerable portion of
the material now employed in constructing such vessels can be replaced
by material of less cost. For this purpose in constructing such platinum
vessels I plate the surface that is to be exposed to heat with copper or
other comparatively cheap metal, using by preference the electro-
plating process, which may be applied either to the sheet platinum used
for constructing the vessel, or to the vessel after it has been made.
When this plating has become damaged or deteriorated it can be replaced
by fresh electroplating, the protected platinum remaining entire and