IMPROVEMENTS IN THE MANUFACTURE OF POROUS POTS AND POROUS PLATES FOR GALVANIC BATTERIES
Year: 1883

page_text: LETTERS PATENT to Theophilus Coad, of 4, South Street, Finsbury, in the
county of Middlesex, Electrician for an Invention of "IMPROVEMENTS IN
THE MANUFACTURE OF POROUS POTS AND POROUS PLATES FOR GALVANIC
BATTERIES
33
PROVISIONAL SPECIFICATION left by the said Theophilus Coad at the
Office of the Commissioners of Patents on the 1st November 1883.
"
THEOPHILUS COAD, of 4, South Street, Finsbury, in the County of Middlesex,
Electrician IMPROVEMENTS IN THE MANUFACTURE OF POROUS POTS AND POROUS
PLATES FOR GALVANIC BATTERIES
"
This invention relates to the manufacture of porous pots and porous plates used
in galvanic batteries whereby the said pots and plates are rendered more homo-
geneous and have greater conductivity, so as to prevent excess of endosmose and
thereby increase the consistency of the battery
In carrying out my invention I employ the ordinary clay from which porous
pots or plates for galvanic batteries are usually made. The clay after being
thoroughly dried is mixed with a carbonaceous solution; the solution which I have
found to answer well is a mixture of vinegar and sugar. A sufficient quantity of
the solution is added to the clay to give it the proper consistency when it is moulded
or formed into pots or plates in the usual manner.
The pots or plates thus moulded or formed are dried and then placed in vessels
for baking, the pots or plates being surrounded with a suitable carbonaceous matter
such as plumbago. The vessel containing the pots or plates is then hermetically
closed and subjected to the necessary heat usually employed for producing the
ordinary porous pots.
I sometimes treat porous pots or plates made in the usual manner by saturating
them with a carbonaceous solution such as above named, and then surrounding
them with plumbago or the like and refiring them.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Theophilus Coad in the Patent Office on the 1st May 1884.
THEOPHILUS COAD of 4 South Street, Finsbury in the County of Middlesex
Electrician "IMPROVEMENTS IN THE MANUFACTURE OF POROUS POTS AND POROUS
PLATES FOR GALVANIC BATLERIES
"
This invention relates to the manufacture of porous pots and porous plates used
in galvanic batteries, whereby the said pots and plates are rendered more homo-
geneous and have greater conductivity, so as to prevent excess of endosmose and
thereby increase the constancy of the battery.
In carrying out my invention I employ the ordinary clay from which porous
pots or plates for galvanic batteries are usually made. The clay, after being
thoroughly dried, is mixed with a carbonaceous solution; the solution which I
have found to answer well is a mixture of vinegar and sugar, consisting of about
ten quarts of vinegar to fourteen pounds of sugar. A sufficient quantity of the
solution is added to the clay to give it the proper consistency, when it is moulded
or formed into pots or plates in the usual manner. I have found one part of the
above named solution to about nine parts of the usual clay employed for the
manufacture of porous pots to give good results.
The pots or plates thus moulded or formned are dried and then placed in vessels
for baking, the pots or plates being surrounded with a suitable carbonaceous
matter such as plumbago. The carbonaceous matter surrounding the pot as afore-
said is merely for the purpose of excluding the atmosphere whilst the said pots
are being baked. The vessel containing the pots or plates is then hermetically
closed and subjected to the necessary heat usually employed for producing the
ordinary porous pots.
I sometimes treat porous pots or platos made in the usual manner. by saturating
them with a carbonaceous solution such as above named, namely a solution of
about ten quarts of vinegar to fourteen pounds of sugar and then surrounding
them with plumbago or the like and refiring them.
Having thus described the nature of my said invention and in what manner the
samo is to be performed I claim :-
Firstly. The manufacture of porous pots and porous plates for galvanic batteries
from a mixture of ordinary clay and a carbonaceous solution such as vinegar and
sugar substantially as and in the manner hereinbefore described.
Secondly. Surrounding during the baking operation porous pots and porous
plates made from a mixture of ordinary clay and the carbonaceous solution afore-
said with a suitable carbonaceous matter such as plumbago, the vessel in which
the pots or plates are placed for baking being hermetically scaled as aforesaid
substantially as and for the purpose herein before set forth.
Thirdly. Treating porous pots or plates made in the usual manner by saturating
them with a carbonaceous solution such as vinegar and sugar and then surrounding
them with plumbago or the like and refiring them substantially as hereinbefore
described.
In witness whereof I the said Theophilus Coad have hereto set my hand and
seal this thirtieth day of April in the year of our Lord one thousand eight hundred
and eighty four