Improvements in Damping and Copying Letters and other Documents.
Year: 1888

page_text: Date of Application, 9th Nov., 1888
Complete Specification Left, 22nd Jan., 1889
Complete Specification Accepted, 23rd Feb., 1889
PROVISIONAL SPECIFICATION.
Improvements in Damping and Copying Letters and other
Documents.
We, CROWTHER HARRISON, and CONWAY MORRIS both of 21 Great St. Helens,
London, E.C. Merchants do hereby declare the nature of this invention to be as
follows:-
The object of our Invention is to provide means whereby several copies of type
written letters, letters written with copying ink and other documents may be readily
reproduced in a Letter Book or upon detached sheets on the application of pressure
through any ordinary Copying Press and without the necessity as heretofore of
keeping the leaves in a dampened or moistened condition.except or beyond the uniform
moisture thrown out by the " damper" (which it is only necessary to moisten each
day) as hereinafter described.
"
The damping device or damper" referred to above comprises a pad of suitable
form size and substance as a stiffening or foundation, and we place upon it a piece of
absorbent lint with or without waterproof backing, over which again a sheet of asbestos
is placed with a covering of not work upon the surface; the whole devico being
securely sewn or otherwise attached. Said damper may be placed beneath a perfectly
dry leaf in a Letter Book or otherwise with the letter or other document over the
leaf; and by the usual pressure in a Copying Press, the leaf and letter are
simultaneously dampened and copied.
Any number of Letters or other documents may be copied at one time by placing
a separate "Dainper" between each leaf with the document requiring to be copied
facing the dry leaf, or by using "dampers" constructed with two faces so as to copy
two letters with one "damper."
1000

page_text: Improvements in Damping and Copying Letters and other
Documents.
We, CROWTHER HARRISON, and CONWAY MORRIS both of 21 Great St. Helens,
London, E.C. Merchants 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 :—
The object of our Invention is to provide means whereby several copies of typo
written letters, letters written with copying ink and other documents may be readily
reproduced in a Letter Book or upon detached sheets on the application of pressure
through any ordinary Copying Press and without the necessity as heretofore of
keeping the leaves in a dampened or moistened condition except or beyond the
uniform moisture thrown out by the "damper" described below (and which it is only
necessary to moisten at all events each day) inasmuch as we find the "damper" will
retain moisture for a considerable time; for instance, say a week, or longer.-
Furthermore, we find as the result of our practical experiments that by means of our
Invention, documents of either old or recent writing, even if written with non-copying
ink, may, after the lapse of a very considerable time, be copied, without injuring the
original, by saturating one of the "dampers" herein referred to, with the chemical
compound known as Rogers' preparation described in the Specification of Patent
No. 14,2740.
"
27
The damping device or damper" referred to above comprises a pad of suitable
form, size and substance as a stiffening or foundation, and we place upon it a piece of
absorbent lint, felt, or the material known as "jackonette or any similar material
with or without waterproof backing, over which again a slicet of asbestos is placed
with a covering of net work upon the surface (although said covering of network
is not indespensable). The whole device having been securely sewn or otherwise
attached, said "damper" may be placed beneath a perfectly dry leaf in a Letter
Book, or otherwise, with the letter or other document over the leaf; and by the
usual pressure in a copying Press, the leaf and letter are simultaneously damped
and copied.
We wish it to be understood that it forms a valuable feature distinctive of our
Invention that by means thereof we are enabled to ensure that a number of loose
copying sheets may, when desired, be kept ready for use-enclosed within two
dampers without the necessity for using "driers" (drying sheets or blotting paper);
and, by using,
a "damper" having two faces, two documents can be copied with
one "damper.

page_text: 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 :-
First The copying device substantially as herein set forth and described.
Second-In devices for reproducing letters or other documents, the employment
of a sheet or of sheets of asbestos either alone or in combination with lint, felt, or the
material known as "jackonette" or any similar material, substantially as herein set
forth and described.