Improvements in Producing Matrices for Casting Stereotypes.
Year: 1890

page_text: Date of Application, 18th July, 1890
Complete Specification Left, 16th Apr., 1891-Accepted, 16th May, 1891
PROVISIONAL SPECIFICATION.
Improvements in Producing Matrices for Casting Stereotypes.
::
"
We, JAMES STURROCK, Cashier, Dundee Advertiser Office, Bank Street,
Dundee, in the County of Forfar, North Britain, and GEORGE DUNCAN
MACDOUGALD, Chemist, High Street, Dundee, aforesaid, do hereby declare the
nature of this invention to be as follows, that is to say :-
Our said invention has for its object to expedite the production of matrices
for casting stereotypes and to secure a uniform and sufficient sharpness in
all parts.
In carrying out our invention we use any usual or suitable matrix material
moistened with water or if preferred with some suitable liquid which will evaporate
more quickly than water; and after applying the matrix material to the type in
the usual way we place the type with the matrix material on it in an air-tight
vessel from which we cause the air and vapor to be exhausted by a pump or other
suitable appliance. At the same time we apply heat either to the under side of the
type alone or both to the type and also to the upper side of the above matrix
material. With these arrangements the matrix is rapidly dried whilst in contact
with the types, and a superior result is obtained.
Dated this Seventeenth day of July 1890.
EDMUND HUNT,
Applicants' Agent.
Per pro David Ferguson.
COMPLETE SPECIFICATION.
Improvements in Producing Matrices for Casting Stereotypes.
We, JAMES STURROCK, Cashier, Dundee Advertiser Office, Bank Street
Dundee, in the County of Forfar, North Britain, and GEORGE DUNCAN
MACDOUGALD, Chemist, High Street, Dundee, aforesaid, 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, that
is to say:-
Our said invention has for its object to expedite the production of matrices
for casting stereotypes, and to secure a uniform and sufficient sharpness in
all parts.
In carrying out our invention we use any usual or suitable matrix material
moistened with water, or if preferred, with some suitable liquid which will evaporate
more quickly than water; and after applying the matrix material to the type in the
usual way, we place the type with the matrix material on it in an air-tight yes 1
from which we cause the air and vapor to be exhausted by a pump or other suital:
appliance. At the same time we apply heat, either to the underside of the te
alone, or both to the type and also to the upper side of or above the matx
material.
For the purposes of our present invention we may employ apparatus the same,
or substantially the same as that described and delineated in our earlier Patent
Specification No. 17229 of 1889; but whereas in such earlier Specification the
bottom plate of the apparatus was described as being made hollow for the purpose
of passing through it cold water to cool the types. by our present invention we
pass hot water or other suitable heated fluid through the said hollow bottom plate.
When applying heat not only below the type but also above the matrix material

page_text: we may employ a heated plate for the latter purpose, as described in our said earlier
Specification.
Or instead of using apparatus like that described in our said earlier Specification
we may modify or adapt the ordinary hot press hitherto employed for stereotyping,
so as to render it suitable for carrying out our present invention.
With the arrangements hereinbefore described the matrix is rapidly dried whilst
in contact with the type, and a superior result is obtained.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is
The improved process for the production of matrices from type, in which the
drying of the matrix is effected in a closed vessel from which air is exhausted and
in which heat is applied either to the under side of the type alone or both to
the type and also to the upper side of or above the matrix material substantially
as hereinbefore described.
Dated this Fifteenth day of April 1891.
EDMUND HUNT,
Applicants' Agent.