IMPROVEMENTS IN THE METHOD AND MEANS OF REPRODUCING PLANS, DRAWINGS, WRITING, and the like
Year: 1878

page_text: LETTERS PATENT to Frank Wirth, of the Firm of Wirth and Company, Patent
Solicitors, at Frankfort-on-the-Main, in the Empire of Germany, for the
Invention of "IMPROVEMENTS IN THE METHOD AND MEANS OF REPRODUCING
PLANS, DRAWINGS, WRITING, and the like." A. communication from Emil
Holtzmann, Manufacturer, of Speyer, in the Empire of Germany.
PROVISIONAL SPECIFICATION left by the said Frank Wirth at the Office of
the Commissioners of Patents on the 13th May 1878.
FRANK WIRTH, of the Firm of Wirth and Company, Patent Solicitors, at Frank-
fort-on-the-Main, in the Empire of Germany. "IMPROVEMENTS IN THE METHOD
AND MEANS OF REPRODUCING PLANS, DRAWINGS, WRITING, AND THE LIKE,"
[A communication from Emil Holtzmann, Manufacturer, of Speyer, in the Empire
of Germany.]
'
This Invention relates to improvements in the method of and means for repro-
ducing plans, drawings, writing, and the like from one sheet, and in one or various
colours as desired, no special apparatus being required.
e
By means of my said Invention a considerable number of copies may be taken
from one sheet in a very short time, and at a very small cost.
In carrying the said Invention into practice the drawing, or writing, or whatever
it is desired to reproduce, is first made upon tracing paper, which has been prepared
with a mixture of oil and resin and afterwards dried, and for executing these.
drawings or the like, I use colors which consist of dissolved aniline pigments in the
most concentrated condition, filtered in water.
For negative paper I use common, smooth, strong paper, which has been thickly
coated with animal lime.
The operation of taking the copies is as follows, that is to say :—'
-The drawing,
plan, writing, or whatever has to be reproduced, having been made upon the tracing
paper with the said fluid, color, or colors is placed with its face upon the said

page_text: negative paper, the latter having been previously placed in cold water and allowed
to remain there for two or three minutes, and is pressed down evenly to allow the
said negative paper covered with lime to absorb the color or colors. The tracing
paper is then removed and the negative paper is ready to have the copies taken
therefrom. Then the paper upon which the copy is to be taken is, after being
slightly wetted, placed upon the negative and pressed thereon by the hand. A copy
is thus obtained, and in the same way a number of copies may be successively
obtained from the same negative, the number obtainable depending upon the
quantity of color used in the original drawing.
I use paper known as satin paper for the copies.
As many as forty copies may be taken, and the said Invention is applicable to
both the large and small sheets.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed.
by the said Frank Wirth in the Great Seal Patent Office on the 11th
November 1878.
FRANK WIRTH, of the Firm of Wirth and Company, Patent Solicitors, at Frank-
fort-on-the-Maine, in tho Empire of Germany. "IMPROVEMENTS IN THE METHOD
AND MEANS OF REPRODUCING PLANS, DRAWINGS, WRITING, AND THE LIKE"
A communication from Emil Holtzmann, Manufacturer, of Speyer, in the Empire.
of Germany.
This Invention relates to improvements in the method of and means for repro-
ducing plans, drawings, writing, and the like from one original sheet, and
in one colour or various colours as desired, no special apparatus being required.
By the said Invention a considerable number of copies may be taken from one
sheet in a very short time, and at a very small cost.
In carrying the said Invention into practice I employ tracing paper colours,
especially prepared for my purpose, and negative paper. The said tracing paper is
prepared, like other tracing paper, by treating it with a mixture of oil and resin,
and afterwards drying it. Ordinary drawing paper will not serve for my purpose,
as the fluid would render it adhesive to the negative paper. But tracing paper will
serve in all cases, whether for the reproduction of old drawings, or the like, or for
new matter. The colours are dissolved aniline pigments in a highly concentrated
condition or dissolved in water.
The negative paper is ordinary strong, smooth-lined paper, thickly coated with
animal lime.
The operation of taking the copics is as follows, that is to say:-The drawing,
plan, writing, or other matter to be copied or reproduced, is first made upon the
said tracing paper with the said fluid color or colors, it is then placed with its face
upon the said negative paper, the latter having been previously placed in cold
water, and allowed to remain therein for two or three minutes. The said drawing

page_text: or other subject is pressed down evenly, to allow the said negative paper, covered
with lime, to absorb the color or colors. The tracing paper is then removed, and
the negative paper is ready to have the copies taken therefrom; then the paper,
upon which the copy is to be taken, after being slightly wetted, placed upon the
negative and prossed thereon by the hand. A. copy is thus obtained, and in the
same manner a great number of copies may be successively obtained from the same
negative, the number obtainable depending upon the quantity of color used in the
original drawing, plan, or writing.
I use paper known as satin paper for the copies.
As many as forty copies may very easily be taken.
The said Invention is applicable to both large and small sheets.
Having thus fully described the said Invention and the manner of performing
the same, I wish it understood that I claim, the method of reproducing plans,
drawings, writing, and the like, by the use of liquid colours, tracing paper, and
5 negative paper, as above set forth.
In witness whereof, I, the said Frank Wirth, have hereunto set my hand
and scal, this Sixth day of November, in the year of our Lord One
thousand eight hundred and seventy-eight.