IMPROVEMENTS IN THE CONSTRUCTION OF FURNACES FOR CARBONATING OR". DRYING ALKALINE SALTS AND OTHER SUBSTANCES, AND IN THE METHOD OF WORKING THE SAME.
Year: 1872

page_text: LETTERS PATENT to Thomas Gibb and Charles Gelstharp, both of
Jarrow-on-Tyne, in the County of Durham, for the Invention of
"IMPROVEMENTS IN THE CONSTRUCTION OF FURNACES FOR CARBONATING OR".
DRYING ALKALINE SALTS AND OTHER SUBSTANCES, AND IN THE METHOD OF
WORKING THE SAME.'
"
Sealed the 2nd August 1872, and dated the 8th February 1872.
PROVISIONAL SPECIFICATION left by the said Thomas Gibb and
Charles Gelstharp at the Office of the Commissioners of Patents,
with their Petition, on the 8th February 1872.
We, THOMAS GIBB and CHARLES GELSTHARP, both of Jarrow-on-Tyne,
in the County of Durham, do hereby declare the nature of the said
Invention for "IMPROVEMENTS IN THE CONSTRUCTION OF FURNACES FOR
CARBONATING OR DRYING ALKALINE SALTS AND OTHER SUBSTANCES, AND IN THE
METHOD OF WORKING THE SAME," to be as follows:-
Instead of the working bed ordinarily employed in reverberatory
furnaces, a horizontal pan which is caused to revolve on its vertical axis.

page_text: is used. On this pan the alkaline salt or other substance to be car-
bonated or dried is spread, as on the ordinary furnace bed, and the
stirring thereof, which is usually performed by rakes worked by manual
labour or in some cases mechanically, is effected by means of a plough-
shaped stirrer which turns over the alkaline salt or other substance
under treatment, as it is carried forward by the revolution of the
pan. The stirrer is moved gradually across the pan, and it is preferred
that this movement of the stirrer as well as the revolution of the
pan be effected by suitable machinery such as is well known and
understood.
More stirrers than one may be used, and the stirring may be effected
without lateral motion. With the stirrer or stirrers a loose ball, roller,
or other suitable apparátus is employed to crush any lumps formed in
the mass of material under treatment.
66
The alkaline salt or other substance is charged into the furnace,
worked and discharged in the same manner as described in the Speci-
fication of an Invention of Improvements in the Construction of
Furnaces for Calcining Ores and other Substances, and in the Method of
Working the same," for which Letters Patent were granted to us bearing
date the Twenty-second day of October, in the year of our Lord 1869,
and numbered 3074.

page_text: stirring may be effected without lateral motion. In conjunction with
the stirrer or stirrers a loose ball, roller, or other suitable apparatus is
employed to crush any lumps formed in the mass of material under
treatment.
The alkaline salt or other substance is charged into the furnace,
worked and discharged in the same manner as described in the Specifi
cation of an Invention of "Improvements in the Construction of Furnaces
for Calcining Ores and other Substances, and in the Method of Working
the same," for which Letters Patent were granted to us bearing
date the 22nd day of October, in the year of our Lord 1869, and
numbered 3074.
Having thus declared and ascertained the nature of our said Invention,
we would remark in conclusion that what we consider novel and original,
and therefore claim as constituting the Invention secured to us by the
said herein-before recited Letters Patent are, the construction of 1
furnaces for carbonating or drying alkaline salts and other substances,
and the method of working the same, substantially as herein-before
described and set forth.
In witness whereof. we the said Thomas Gibh and Charles