Year: 1888

page_text: Date of Application, 17th May, 1888
Complete Specification Left, 1st Dec., 1888
Complete Specification Accepted, 15th Jan., 1889
in proportions determined by the required consistency of the compound.
For the purpose of my invention I first melt the glue and leave it to simmer until
all the water has evaporated from it and this pure glue I stir in to a pan of melter!
rosin, the heat of which is somewhat low.
I bake the plaster of paris and then grind it to a powder, sifting the flour therefrom,
which.I mix with Glycerine and make a paste. This paste I stir gradually into the
combination of glue and rosin until thoroughly amalgamated.
This compound can be stored for after use.
The compound, when required for the preparation of a printing surface, is heated and
spread upon millboard or strawboard (which has been specially prepared as hereafter
described) to the desired height.
I prefer to use strawboard in which case I steep or saturate it in a bath of methylated
spirit and varnish (hard brown), and when it has absorbed sufficient of the spirit and
varnish I allow it to rest for a time and then coat the surface on which the compound
is to be spread with a stronger coating of hard brown varnish mixed with methylated
spirit.

page_text: The surface of the straw board thus prepared is of such a character that the
compound will adhere to it and yet be readily removable therefrom without destroying
the varnished surface.
The compound when it has to be spread is heated and placed into a box or trough
having an angled side and a movable flap adjustable by screw or other means to limit
the degree of opening of the bottom of the flap for the fluid compound to flow, said
box or trough being steam or hot water jacketted to maintain 'the temperature of the
fluid compound.
The table upon which the fluid compound is poured is perfectly smooth and highly
polished and has fillets or guage bars at the sides and ends to determine the height or
desired thickness of the compound when poured in from the heated box before
mentioned this being passed over to discharge the compound on to the table as it
travels which method prevents the formation of air bubbles in the compound and leaves
the top surface perfectly smooth, a roller being caused to follow the box to solidify
and to squeeze forward any superfluous compound.
The roller has the strawboard upon it and as the roller passes over the compound
the board is left upon it.
The compound covered strawboard is now removed from the table and is exposed
for cooling and setting or the compound covered strawboard may remain on the table
to cool down after the bottom heat has been removed.
When the compound covered strawboard is required for printing I, by means of
cutter dies which correspond to the letters or numerals to be represented in print and
made up into a chase or forme, cut, by pressure, through the compound, the depth of
the cutting corresponding with its thickness, so that the surface of the strawboard is
not destroyed, the letters, numerals, or devices, so cut are removed, the remaining
surface being used for surface printing but the surface portion may be removed and
the letters, numerals or devices remain on the strawboard for printing purposes by a
flat, a platen, or other printing press or by cylinder printing machines the pliability
of the strawboard with the compound thereon being fixed to the cylinder like an
ordinary segmental electro.
Instead of cutting the letters, numerals or devices by cutter dies as before described,
a template or stencil of the letters, numerals, or devices may be placed upon the com-
pound and then by dusting a light powder on it, the interstices in the template or stencil
would be clearly indicated upon the compound so that the letters, numerals, or devices
can be cut through and removed by hand, or the surface body of the compound
removed.
The compound prepared and strawboarded as hereinbefore described is specially
applicable for "Posters" "Show bills," "Show cards" and the like and in addition
to the numerals, letters or devices a plain or fancy border may be simultaneously or
otherwise formed by stamping or by cutting out the desired parts in any suitable
manner.
Datel 2: 178 I
2000

page_text: in proportions determined by the required consistency of the compound and as an
example for the purpose of my invention, I first soak and melt 4 lbs. Best Glue in
4 lbs. water and leave it to simmer until all the water has evaporated. To this glue I
add 2 lbs. Crystallized Sugar which dissolves by agitation and I pour this combination
into a pan containing 4 lbs. Melted Resin, the heat of which is somewhat low.
I bake the Plaster of Paris and then grind it to a powder, sifting the flour therefrom,
with which I mix Glycerine by a grinding operation and make a paste. This pasto I
stir gradually into the combination of ingredients before mentioned until thoroughly
amalgamated and constitutes the compound suitable for printing purposes.
The compound when required for use is heated and spread upon zinc plates, the
surface of which has been previously coated with size, or it may be on the surface of
millboard or strawboard, in which case, I steep or saturate it i.e. the millboard or
strawboard, in a bath of Methylated Spirit and Varnish (Hard Brown) and when it
has absorbed sufficient of the Spirit and Varnish, I allow it to rest for a time and then
re-coat the surface with a stronger coating of Hard Brown Varnish mixed with
Methylated Spirit. The thickness of the compound to be put on the plate, or on the
mill or strawboard, is determined by rollers, and these not only squeeze the compound
to make it level, but they obviate the formation of air bubbles, thereby leaving the
surface perfectly smooth.
.
The compound may spread itself, by flowing from an opening of a box, which may
move over the zinc plate or board, or the zinc plate may be moved under the box and
be then passed under rollers for levelling the compound. The millboard thus prepared,
or the zinc plate thus sized and coated with the compound, is removed for the
compound to harden off.

page_text: The compound can be kept in store before it is spread on to the zinc plate, a
re-heating only being necessary, or the zine plate with the compound on, may be kept
without destroying the utility of the compound for after use.
When the compound covered strawboard or zinc plate is required for printing I, by
means of cutter dies (which correspond to the letters or numerals to be represented in
print and made up into a chase or forme if desired) cut, by pressure, through the
compound, the depth of the cutting corresponding with its thickness, so that the
surface of the zinc plate or millboard is not destroyed, the letters numerals, or devices
so cut are removed, the remaining surface being used for surface printing, or the
surrounding compound may be removed and the letters, numerals, or devices remain
on the zine plate or board to be used as printing surfaces.
A template or stencil of the letters, numerals, or devices, may be placed upon the
compound and then by dusting a light powder on it, the interstices in the template or
stencil would be clearly indicated upon the compound, so that the letters, numerals, or
devices can be cut through and removed by hand, or the surface body of the compound
removed.
The pliability of the zinc plate, or of the board with the compound thereon will
permit of its being fixed to a cylinder printing machine like an ordinary segmental
stereo or electro-plate.
The compound prepared as hereinbefore described is specially applicable for
"Posters," "Show Bills," "Show Cards" and the like and in addition to the
numerals, letters, or devices, a plain or fancy border may be simultaneously or
otherwise formed by stamping or by cutting out the desired parts in any suitable
manner.
The compound may have an impression of any device transferred or printed on it
and then the desired parts can be cut out.
The proportions of the ingredients may be slightly varied to suit the desired
consistency of the compound..
Having now particularly described and ascertained the nature of this inven
tion and in what manner the same is to be performed I declare that what
I clam is :-
:-
The manufacture of compounds for printing purposes by the particular treatment
and preparation of the ingredients mentioned in the manner described.
1st day of Decemb
1000
H. GARDNER,
166, Fleet Street, London,
Agent for the said Alfred John Parker.