Improvements in the Method of Producing Lithographic Stippling.
Year: 1890

page_text: This Specification was, upon the 31st day of December 1891, Amended under
Sections 18 to 21 of the Patents, Designs, and Trade Marks Act, 1883.
Date of Application, 21st Oct., 1890-Accepted, 13th Dec., 1890
COMPLETE SPECIFICATION (AMENDED).
Improvements in the Method of Producing Lithographic Stippling.
I, CHARLES HAMILTON GORDON, of 590, Main Street, East Orange, in the County
of Essex, and State of New Jersey, United States of America, Lithographer, 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 this invention is to provide a new and improved method for rapidly
and accurately producing lithographic stippling similar in effect to that now ordinarily
produced by hand or mechanical means.
The improved process consists of forming, by transfer, an even stipple on the stone
or plate, by an acid resisting ink, then etching the unprotected part of the stone-or
plate, and then-removing the ink stipple from the stone:
Lithographic drawings on stone, as heretofore made, having what is known as
stipple. work, were stippled by taking a pen and producing on the stone, with litho-
graphic or greasy ink, dot after dot, which is very slow and tedious and is also a very
expensive process, for, in order to bring out various effects in the finished picture,
skilled artists have to be employed to do this work.
To supersede, in a measure, this expensive and slow process is the object of this
invention, and I produce, by the improved method, a picture which is similar in effect
to those produced by the process just mentioned.
I usually proceed as follows:- -An evenly stippled stone or plate is made by the
ordinary handwork, or is engraved by mechanical means. From this stipple a full
impression is taken in an acid-resisting ink on lithographic transfer paper and this
impression is transferred to a lithographic stone or zinc plate in the usual manner.
When the stone or plate is thoroughly dry and the ink is yet moist, the stone is
dusted with finely powdered asphaltum, resin, or other gum, so that the impression is
carefully protected. The part of the stone not protected by the stipple ink is then
etched to a suitable depth, care being taken that the ink stipple remains solid and
sharp as it appeared on the original impression. The ink stipple is then removed from
the stone by washing the latter with turpentine or similar substance and when the
stone or plate is thoroughly cleaned the surface is grained with fine sand which forms
a tooth for the lithographic chalk or crayon at the same time assisting the artist to get
the desired tones in the picture. The stone-is etched etching of the stone should be
sufficiently deep to allow for the loss caused by the graining process which latter not
only enables the artist to produce many gradations of color but also serves to cleanse
the surface of the stone thereby ensuring the solidity of the work. The graining is,
naturally, so slight as not to injure the points or projections but sufficient to produce
the desired result. It also removes any impurities which may adhere to the surface
of the stone or plate. The latter is now ready to receive the drawing which is
produced by the lithographic artist with the ordinary lithographic crayon on the
points of the stipples the solids being made with ink in the usual manner. When the
drawing is fini-hed it is treated with acid, rolled up and proved in the usual way.
By this process the lithographic crayon artist can, with great rapidity, produce

page_text: similar effects to those made by the stipple artist in his very slow method by working
with the pen to make dot by dot. Instead of the stipple dots, full solid lines may be
substituted so as to produce the effect of a line engraving.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :
1. The herein described method for producing lithographic stippling, consisting of
first forming, by transfer, an even-stipple on the stone or plate, by un acid resisting
ink, and then etching the unprotected part of the stone or plate after which the ink
stipple is removed from the stone, substantially as set forth.
21. The herein described method for producing lithographic stippling, consisting
of first forming, by transfer, an even stipple on the stone or plate, by an acid-resisting
ink, and then etching the unprotected part of the stone or plate, after which the ink
stipple is removed from the stone, and then graining the stone with fine sand,
substantially as set forth.
3. 2. The herein described method for producing lithographic stippling, consisting
of first forming, by transfer, an even stipple on the stone or plate, by an acid-
resisting ink, and then etching the unprotected part of the stone or plate, after which
the ink stipple is removed from the stone, then graining the stone with fine
sand, and then forming the picture on the points of the stipple with the
ordinary lithographic crayon, the solids being "made with ink, substantially as
set forth.
Danau MOK GIRI APAV AT Lloroñor IXUS
DRINGED HUN GANZIRIVAT Lloronar LXUY
C. H. GORDON.
By A. M. & Wm. Clark,
53, Chancery Lane, London, Patent Agents.