IMPROVEMENTS IN OR RELATING TO THE MANUFACTURE OR PREPARATION OF PAPER FOR COPYING PURPOSES
Year: 1883

page_text: LETTERS PATENT to William Phillips Thompson of the Liverpool and London
Agency for Foreign Patent Solicitors 6 Lord Street Liverpool in the county
of Lancaster for an Invention of "IMPROVEMENTS IN OR RELATING TO THE
MANUFACTURE OR PREPARATION OF PAPER FOR COPYING PURPOSES
"
a com-
munication to him from Morgan Washington Brown resident at the city of
Brooklyn state of New York
PROVISIONAL SPECIFICATION left by the said William Phillips Thompson
at the Office of the Commissioners of Patents on the 14th August 1883.
WILLIAM PHILLIPS THOMPSON of the Liverpool and London agency for Foreign
"IMPROVE-
Patent Solicitors 6 Lord Street Liverpool in the county of Lancaster
MENTS IN OR RELATING TO THE MANUFACTURE OR PREPARATION OF PAPER FOR
COPYING PURPOSES."–
'-a cominunication to me from Morgan Washington Brown
resident at the city of Brooklyn State of New York.
The nature of this invention consists in a new method or process for treating
paper, so as to render it permanently moist for copying purposes, and in the article
so produced.
Take one pound of the salt known as the chloride of magnesium and dissolve it
From one
in a moderate quantity of cold or warm water, and it is ready for use
half a pound to a pound of water to the pound of chloride of magnesium is found
to be the most desirable amount, but more or less can be used according to
circumstances. The chloride of magnesium may be dissolved in other liquids, but
water is equally good.
Apply this solution to the sheets of ordinary copying paper, whether in book
form or otherwise, in any usual and well known manner, and preferably. by
applying said compound to cloth pads well saturated with the liquids, and then
place the pads between any suitable number of leaves, then apply a pressure at
first very moderate until the absorption of the paper is complete, then remove the
cloth pads and apply under the press a strong pressure and the books or sheets of

page_text: paper so treated are ready for copying purposes, the use of the solution of chloride
of magnesium being the radical or base of this invention.
In all cases use copying inks (or fluids which are preferable)
Paper prepared by this method will remain permanently moist at any ordinary
temperature, and if made dry by any extraordinary heat will regain its moisture
upon being subjected to the common temperature.
Compounds composed mainly of glycerine have heretofore been used for
moistening paper for copying purposes, but the method or process herein set forth
bas many advantages over and is a great improvement upon all methods heretofore
used for treating paper so as to make it perpetually moist for copying purposes.
It.is much more economical than methods, heretofore used as there is a great saving
in cost of materials time and labour, it only costing about one eighth as much to
treat paper by this method as by methods previously used. Sheets of paper
prepared by this method will not adhere to each other as is frequently the case
where the paper is prepared by previously known methods, where compounds
composed mainly of glycerine are used, and hence paper prepared by the method
or process herein described is more suitable and convenient for copying purposes
and will take a very clear and distinct copy. Other deliquescent, transparent,
colorless neutral salts, such as chloride of calcium, can be substituted for the
chloride of magnesium but they are not so good

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said William Phillips Thompson in the Patent Office on the
18th February 1884.
WILLIAM PHILLIPS THOMPSON, of the Liverpool and London Agency for Foreign
Patent Solicitors, 6, Lord Street, Liverpool, in the county of Lancaster, Civil
Engineer. "IMPROVEMENTS IN OR RELATING TO THE MANUFACTURE OR PREPARATION
OF PAPER FOR COPYING PURPOSES" a communication to me from Morgan Washington
Brown, resident at the city of Brooklyn, State of New York.
The nature of this invention consists in a new method or process for treating
paper so as to render it permanently moist for copying purposes, and in the article
so produced.
Take one pound of the salt known as the chloride of magnesium and dissolve it
in a moderate quantity of cold or warm water and it is ready for use. From
one-half a pound to a pound of water to the pound of chloride of magnesium is
found to bo the most desirable amount, but more or less can be used according to
circumstances. The chloride of magnesium may be dissolved in other liquids, but
water is equally good.
Apply this solution to the sheets of ordinary copying paper, whether in book
form or otherwise, in any usual and well known manner and preferably by
applying said compound to cloth pads well saturated with the liquids, and then
place the pads between any suitable number of leaves; then apply a pressure at
first very moderate until the absorption of the paper is complete; then remove the
cloth pads and apply under the press a strong pressure and the books or sheets of
paper so treated are ready for copying purposes, the use of the solution of chloride
of magnesium being the radical or base of this invention.
In all cases use copying inks or fluids which are preferable.
Paper prepared by this method will remain permanently moist at any ordinary
temperature, and if made dry by any extraordinary heat will regain its moisture
upon being subjected to the common temperature.
Compounds composed mainly of glycerine have heretofore been used for
moistening paper for copying purposes, but the method or process herein set forth
has many advantages over and is a great improvement upon all methods heretofore
used for treating paper so as to make it perpetually moist for copying purposes.
It is much more economical than methods heretofore used as there is a great saving
in cost of materials, time and labour, it only costing about one-eighth as much to.
treat paper by this method as by methods previously used. Sheets of paper
prepared by this method will not adhere to each other as is frequently the case
where the paper is prepared by previously known methods where compounds
composed mainly of glycerine are used, and hence paper prepared by the method
or process herein described is more suitable and convenient for copying purposes
and will take a very clear and distinct copy. Other analogous deliquescent salts
producing the same results may be substituted for the chloride of magnesium, but
that is preferred.
Having thus described the nature of this invention and the manner the same is
to be performed as communicated to me by my foreign correspondent, I would
have it understood that I claim under the Letters Patent :-
1st. The method or process for treating paper for copying purposes so as to
ronder it permanently moist, by moistening or saturating such paper with a

page_text: solution of the chloride of magnesium or other analogous doliquescent salt producing
the same result, substantially as set forth and specified.
2nd. As a new manufacture, paper impregnated with chloride of magnesium or
other analogous deliquescent salt for the purpose set forth.
In witness whereof I the said William Phillips Thompson have hereunto set
my hand and seal this ninth day of February in the year of our Lord ono
thousand eight hundred and eighty four.
M