Reproducing Writings, Drawings, and other Delineations.
Year: 1887

page_text: Date of Application, 2nd Apr., 1887
Complete Left, 2nd Jan., 1888
Complete Accepted, 3rd Feb.. 1888
Reproducing Writings, Drawings, and other Delineations.
I, WILLIAM CHARLES HALL of 36 Farringdon Street, in the City of London,
Warehouseman, do hereby declare the nature of this invention to be as follows:-
The invention relates to that class of apparatus known as the " Hektograph" for
which Letters Patent were granted to John Guy Wilson dated the 13th day of
November 1878 No. 4606.
In apparatus of this character it is necessary after having used the gelatine slab for
printing purposes either to allow the negative to remain upon and sink into the slab
or to wash it off with water in order to leave a clean surface for the next transfer.
In cases where the negative is allowed to sink into the body of the slab in lieu of
washing it off, the slab quickly becomes saturated with ink and is thereby rendered
useless.
Now according to my invention I obviate this defect by adding to the gelatine
composition in the course of manufacture a small proportion of Hydrochloric acid or
other suitable material acting in a like manner which will have the effect of completely
bleaching the aniline ink in the course of about from one to two hours after the
negative has been formed upon the slab thus enabling the slab to be used effectively
much longer than was possible according to the method heretofore adopted.
Where it is desired to wash off the negative from the slab I propose to employ for
this purpose a solution of hydrochloric acid or other suitable material and water by
which means the removal of the ink from the slab will be greatly facilitated.
I also according to my invention employ a sheet of glass as a base for the gelatine

page_text: slab which slab form of a transparent composition and I cement at the back of the
glass a printed sheet giving full directions for the use of the apparatus by which
means such directions can be read right through from the face of the slab whilst they
are at the same time permanently attached to the apparatus.
I further according to my invention treat the paper which is to receive the prints
with bi-chromate of potash which has the effect of darkening the ink and thus enables
me to obtain more perfect prints than heretofore.
Dated this 2nd day of Auril LSS7
WILLIAM CHARLES HALL.
By Harris & Mills,
23, Southampton Buildings,
Agents.

page_text: Apparatus 101
Reproducing Writings, Drawings, and other Delineations.
I, WILLIAM CHARLES HALL formerly of 36 Farringdon Street, but now of 123
Cannon Street, in the City of London, Warehouseman, 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 and by the following statement:-
2:
The invention relates to that class of apparatus known as the " Hektograph for
which Letters Patent were granted to John Guy Wilson dated the 13th day of
November 1878 No. 4606.
In apparatus of this character it is necessary after having used the gelatine slab for
printing purposes either to allow the negative to remain upon and sink into the slab
or to wash it off with water in order to leave a clean surface for the next transfer.
In cases where the negative is allowed to sink into the body of the slab in lieu of
washing it off, the slab quickly becomes saturated with ink and is thereby rendered
useless.
Now according to my invention, I obviate this defect by adding to the gelatine
composition in the course of manufacture a small proportion of certain materials
which will have the effect of completely bleaching the aniline ink in the course of
about from 10 to 12 hours after the negative has been formed upon the gelatine slab
thus enabling the slab to be used effectively much longer than was possible according
to the method heretofore adopted.
In carrying my invention into effect I have found the following formula to give
good results.
Hektograph composition
Nitrate of Potassium
Soda crystals
Hydrochloric acid
or
Hektograph composition
Nitrate of Potassium
Soda crystals
-
400 parts
"
"3
21
"
400 parts
2층
"
-
2
"
These materials may be combined during the ordinary and well known process of
manufacturing Hektograph composition and the solids may be previously dissolved in
the water or in part of the water which is to form one of the constituents of such
composition. Or the solids may be reduced to a fine state of division and introduced
into the manufactured composition while the latter is in a fluid condition the entire
mass being then well roused or stirred in order to ensure the proper combination of
the various ingredients.
I also according to my invention employ a sheet of glass or other transparent

page_text: substance as a base for the gelatine slab, which slab I form of a transparent com-
position and I cement at the back of the glass a printed sheet giving full directions
for the use of the apparatus by which means such directions can be read right
through from the face of the slab whilst they are at the same time permanently
attached to the apparatus and protected from injury.
In my provisional specification I described certain processes for facilitating the
washing off of the negative from the slab and for treating the paper which is to
receive the prints with a view to darken the ink thereof but I have found that such
processes do not possess such an amount of utility as to render it desirable to make a
claim thereto and therefore desire to disclaim and I do hereby disclaim such
processes.
I would here remark that in the formulæ above named the various ingredients and
the proportions thereof are merely given by way of example and it will be evident
that equivalent materials acting in a like manner may be substituted therefor without
departing from the nature of my invention.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is :-
1. In means or apparatus of the character hereinbefore described, the employment
in combination, with the gelatinous slab, of certain materials which will have the
effect of bleaching the aniline ink employed to produce the negative in manner
substantially as hereinbefore described and for the purpose stated.
2. In means or apparatus of the character hereinbefore described, the employment,
as a base for the gelatinous slab, of a sheet of glass or other transparent substance
upon the back of which is cemented a printed sheet of directions in manner
substantially as herein before described and for the purpose stated.
Dated this 2nd day of January 1888.
WILLIAM CHARLES HALL.
By Harris & Mills,
23, Southampton Buildings,
Agents.