IMPROVEMENTS IN THE MANUFACTURE OF STEEL
Year: 1870

page_text: LETTERS PATENT to Carl Louis Franke, of Field's Hotel, No. 13,
Wilson Street, Finsbury, in the County of Middlesex, Engineer,
for the Invention of "IMPROVEMENTS IN THE MANUFACTURE OF STEEL."
Sealed the 6th December 1870, and dated the 21st June 1870.
PROVISIONAL SPECIFICATION left by the said Carl Louis Franke at
the Office of the Commissioners of Patents, with his Petition, on
the 21st June 1870.
I, CARL LOUIS FRANKE, of Field's Hotel, No 13, Wilson Street,
Finsbury, in the County of Middlesex, Engineer, do hereby declare the
nature of the said Invention for "IMPROVEMENTS IN THE MANUFACTURE Or
STEEL," to be as follows:-
This Invention has for its object improvements in the manufacture of
steel.
For this purpose I take cast iron and melt it in a puddling or similar
furnace. I then add to it 7 or 8 per cent. or thereabouts of hammer slag
and one or two per cent. or thereabouts of a chemical mixture herein-
after set forth. The metal is well rabbled so as to throughly mix it

page_text: with the chemicals. When it boils, as it will do under this treatment,
a further quantity of the chemical mixture is added, say about one per
cent. Afterwards the metal is balled up, and it may then be hammered
or squeezed and rolled into bars in the usual way. Or instead of being
balled the metal may be kept at such a heat as to admit of its being
run into moulds, and before so running it into moulds I occasionally add
speigel eisen.
To obtain a superior quality of steel I reheat the puddle balls or other
blocks or pieces of steel and sprinkle them whilst in the furnace with
about one per cent. of the chemical mixture. I weld together a number
of puddle balls and draw them down together so as to obtain a forging
of any required shape. In a similar way I reheat scrap steel, and treat
it with the chemical mixture, weld together, and draw it down into bars
or other desired form.
The chemical mixture consists of,-
26.9 parts of boracic acid.
21.5
دو
دو
13.4
دو
دو
10.3
دو
دو
8.6
"
وو
6.1
"
"
3.9
وو
"
3.7
"
دو
2.8
spathose iron ore.
hydroclorate of soda.
prussiate of potash.
peroxide of manganese.
dry carbonate of soda.
magnetic iron ore.
graphite.
evanide of potassium.
on the 20th December 1870.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, CARL ·
LOUIS FRANKE, of Field's Hotel, No. 13, Wilson Street, Finsbury, in the
County of Middlesex, Engineer, send greeting.

page_text: WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-first day of June, in the year of
our Lord One thousand eight hundred and seventy, in the thirty-third
year of Her reigu, did, for Herself, Her heirs and successors, give and grant
unto me, the said Carl Louis Franke, Her special license that I, the said
Carl Louis Franke, my executors, administrators, and assigns, or such
others as I, the said Carl Louis Franke, my executors, administrators,
and assigns, should at any time agree with, and no others, from time to
time and at all times thereafter 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 Invention for "IMPROVEMENTS IN THE MANUFACTURE OF
STEEL," upon the condition (amongst others) that I, the said Carl
Louis Franke, my executors or administrators, by an instrument 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 Scal Patent Office within six calendar months
next and immediately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said Carl Louis Franke, do hereby
declare the nature of the said Invention, and in what manner the same
is to be performed, to be particularly described and ascertained in and
by the following statement thereof, that is to say :—
This Invention has for its object improvements in the manufacture
of stecl.
For this purpose I take cast iron and melt it in a puddling or similar
furnace together with seven or eight per cent. or thereabouts, of hammer
slag, or, what is better, I prepare the bottom of the furnace in the usual
way with iron oxide and slag. I then add one or two per cent. or
thereabouts of a chemical mixture herein-after sot forth. The metal
is well rabbled so as to thorougly mix it with the chemicals. When it
boils, as it will do under this treatment, a further quantity of the chemical
mixture is added, say about one per cent. Afterwards the metal is
balled up, and it may then be hammered or squeezed and rolled into
bars in the usual way. This steel may in the form of puddle ball or
otherwise be melted in crucibles for the manufacture of cast steel. I
sometimes reheat the puddle balls or other blocks or pieces of steel and
sprinkle them whilst in the furnace with about one per cent. of the

page_text: chemical mixture. I then weld together a number of puddle balls and
draw them down together so as to obtain a forging of any required
shape. In a similar way I reheat scrap steel and treat it with the
chemical mixture, weld together, and draw it down into bars or other
desired form.
CARL LOUIS FRANKE. (L.S.)