IMPROVEMENTS IN SALT-CAKE POTS, OR POTS FOR THE DECOMPOSITION OF CULORIDE OF SODIUM AND OTHER SALTS, AND IN THE MANUFACTURE OF THE SAME " PROVISIONAL SPECIFICATION
Year: 1880

page_text: LETTERS PATENT to William Fidler, of 15, Montpelier Terrace, Upper
Parliament Street, Liverpool, in the County of Lancaster, for an Invention
of "IMPROVEMENTS IN SALT-CAKE POTS, OR POTS FOR THE DECOMPOSITION
OF CULORIDE OF SODIUM AND OTHER SALTS, AND IN THE MANUFACTURE OF
THE SAME
"
PROVISIONAL SPECIFICATION left by the said William Fidler at the Office
of the Commissioners of Patents on the 20th March 1880.
WILLIAM FIDLER, of 15, Montpelier Terrace, Upper Parliament Street, Liverpool,
in the County of Lancaster. "IMPROVEMENTS IN SALT-CAKE POTS, OR POTS FOR
THE DECOMPOSITION OF CHLORIDE OF SODIUM AND OTHER SALTS, AND IN THE
MANUFACTURE OF THE SAME."
Salt-cake pots as ordinarily constructed are of cast iron, and are very liable to
crack or burn out. To prevent this they are made very thick and cumbrous, and
consequently require great expense in fuel to heat them sufficiently; if made of
rivetted plates they are still worse, as the rivetted joints are at once attacked.
Now my Invention consists in making them of wrought or rolled steel made
with at least all the lower portion in one piece dished or rolled out. The mode of
manufacture which I prefer consists in first rolling or forging a steel plate to
suitable dimensions, and afterwards dishing or pressing it into the required shape,
preferably when hot. Of course I do not bind myself to make the pot of absolutely
one piece, as it might be made with the bottom of one piece and the top or rim of
another, but it is most advantageous, and cheapest in the long run, to make the
entire pot of a single plate of steel.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said. William Fidler in the Great Seal Patent Office on the 14th
September 1880.
WILLIAM FIDLER, of 15, Montpelier Terrace, Upper Parliament Street, Liverpool,
in the County of Lancaster.. "ÎMPROVEMENTS IN SALT-CAKE POTS, OR POTS FOR
THE DECOMPOSITION OF CHLORIDE OF SODIUM AND OTHER SALTS, AND IN THE
MANUFACTURE OF THE SAME."
Salt-cake pots as ordinarily constructed are of cast iron, and are very liable to
crack or burn out. To prevent this they are made very thick and cumbrous, and
consequently require great expense in fuel to heat them sufficiently; if made of
rivetted plates they are still worse, as the rivetted joints are at once attacked.
Now my Invention consists in making them of wrought or rolled steel made
with at least all the lower portion in one piece, dished or rolled out. The mode of
manufacture which I prefer consists in Hirst rolling or forging a steel plate to
suitable dimensions, and afterwards dishing or pressing it into the required shape,
preferably when hot. Of course. I do not bind myself to making the pot of
absolutely one piece, as it might be made with the bottom of one piece and the top
or rim of another, but it is most advantageous, and cheapest in the long run, to
make the entire pot of a single plato of wrought or rolled steel.
The mode of manufacture I prefer is as follows:-I take a plate of, inch or seven
eighths, wrought or rolled steel of required superficial dimensions, heat it to a
bright red heat, and then press it between two cast iron dies to the contour
required.
The Drawing represents the pot as then formed, the dimensions given being
those actually preferred by mc for chloride of sodium decomposition, though of
course I do not bind myself to these dimensions or this exact contour, as for some
purposes it might be preferred deeper or more bellied out at the sides.
There are various other chemical processes where iron pots subject to trying
differences of pressure and corrosive action are required, and in many of these my
steel pots will be found useful.
Having now described my Invention, and given a practical example of what I
consider the best shape and dimensions for salt-cake purposes, I wish it to be
understood that what I believe to be now and desire to protect under the herein-
before in part recited Letters Patent is,-
The manufacture and use of salt-cake pots, or pots for the decomposition of
chloride of sodium or other salts, having their entire structure or their lower part
containing the decomposing mixture formed of a single sheet of wrought or rolled
steel pressed, worked, or hammered into the required shape.
In witness whereof, I, the said William Fidler, have hereunto set my land
and seal, this Ninth day of September, in the year of our Lord One
thousand eight hundred and eighty.
Witness,
W
P. TшоMPSON,
of the Firm of Wm. P. Thompson & Co.,
6, Lord Street, Liverpool,
& 323, High Holborn, London,
Patent Agent.
WILLIAM FIDLER. (L.S.)