Improvements in Electrical Accumulators.
Year: 1896

page_text: Improvements in Electrical Accumulators.
We, ALFRED CONDER, of Dashwood House, New Broad Street, E.C. in the County of
London, Accountant, and PAUL MICHELOT of 49 Rue des Archives Paris, in the
Republic of France Electrician, do hereby declure the nature of this invention to be
as follows:-
According to our invention, the plates, which are designed to receive the paste of
oxide of Lead, are of the usual well known "grid" form, the bars of which may be
arranged obliquely, vertically, or horizontally and may be stamped out of sheet metal-
or cast in a suitable chill. The bars may be of the usual "diamond" section, or any
other form calculated to hold the paste of lead oxide in intimate contact with the
grid.
I may form the grids by casting two plates, the cross bars of which are of suitable
section, and of less thickness than the side bars or frame of the plate, and then
joining the two plates together by autogenous soldering, rivetting or other method,
in such a manner as to form a pocket or envelope, into which the paste of lead oxides
is pressed.
In carrying out our invention we preferably proceed as follows:-We prepare a
mixture of Red Lead or Minium, Litharge, and Sulphate of Magnesia, of varying
proportions for the positive and negative plates, and make into a paste by the
addition of acidulated water and glycerine. This paste we press into the perforations
of the above mentioned grids, and after drying, the plates are arranged positive and
negative alternately, separated by suitable insulators, the connections burned together,
and the battery "formed" in the usual well known manner.
Dated this
Improvements in Electrical Accumulators.
We, ALFRED CONDER of Dashwood House New Broad Street London EC. in the
County of London, Accountant and PAUL MICHELOT, of 49 Rue des Archives, Paris,
in the Republic of France, Electrician do hereby declare the nature of this invention
and in what manner the same is to be performed, to be particularly described and
ascertained in aud by the following statement:-
Our improvements relate to the pasted or "Faure" type of accumulator, in which
the active material, consisting of oxides of Leads and other materials, is pressed when
D77

page_text: in a moist state into metal grids of suitable form, the grids being perfectly
constructed of an inoxydi zable material or metal and of such form that the paste
when pressed into the grid keys itself in.
We may form the grids by casting in a suitable mould or chill, a rectangular metallic
frame, the sides being connected by parallel bars of "diamond" section, so spaced as
to leave square openings through the thickness of the plates. Two such castings are
then placed together in such a manner that the openings in one plate come
immediately over those in the plate below, and the edges burned together or
rivetted.
This form of plate when pasted will if suitably proportioned contain a greater
proportion of active material to its total weight than the usual well known
construction and has the advantage of more firmly holding the active material in
position and in intimate contact with the grid.
In constructing our plates we proceed as follows,
We take one volume of ten per cent. sulphuric acid; that is one part of pure
anhydrous sulphuric acid and nine parts water; and mix with three volumes of pure
glycerine and allow to cool.
In making paste for negative plates we mix one part of Magnesium Sulphate
Crystals with three parts of Red Lead or Minium and six parts of Litharge, and make
into a paste with sufficient of the liquid above described.
For Positive plates we vary the proportions of the above ingredients taking one
part of Magnesium Sulphate Crystals, two parts of Litharge and seven parts of Red
Lead or Minium, making into a paste with sufficient of the liquid above described.
The function of the Magnesium Sulphate is to give porosity to the plate when
when forined and prevent "Sulphatation."
The paste, made as above described is pressed into grids and when dry and hard
the plates are mounted, positive and negative alternately, separated by suitable
insulators, the connections of the positive and negative plates respectively being
burned together and the cell "formed " in Sulphuric acid in the usual well known
nanner.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed we declare that what we
claim is.
1. In Electrical accumulatore, the grid formed by "burning" or rivetting together
two separate grids, as and for the purposes above described.
2. In Electrical accumulators, the paste composed of Sulphuric acid, water,
glycerine, and Magnesium Sulphate, in combination with oxide of Lead as and for
the purposes above described.
Dated this 14th day of May 1897.
JOHN HEWETT, A.M. Inst. E.E.,
8, Great Portland Street, London, W., Agent for the Applicants.