Improvements in or relating to Mezzotint or similar Engraving.
Year: 1891

page_text: Date of Application, 4th Feb., 1891.
Complete Specification Left, 3rd Nov., 1891-Accepted, 5th Dec., 1851
PROVISIONAL SPECIFICATION.
Improvements in or relating to Mezzotint or similar Engraving.
I, NOEL BYRON KENEALY of Bushey Grove, Watford, in the County of Herts.,
Artist, do hereby declare the nature of this invention to be as follows:
The copper steel or other plates at present employed in mezzotint engraving
are so expensive that their employment in any large numbers is prohibitive, the
expense consisting chiefly in "rocking" the surface a process which involves much
time and skill.
The object of this invention is to employ a plate the surface of which has been
prepared for mezzotint engraving as an original or matrix from which any number
of precisely similar plates may be re-produced by means of electro deposition, and
for this purpose I take a gutta-percha or other suitable mould from the original
Locked plate or matrix and on this mould I deposit open able to produce any
steel or other suitable
substance by electro deposition, and by this means
number of copper, or other plates the surfaces of which are exactly similar to the
original or matrix prepared by hand or machine.
Dated this 4th day of February 1891.
W. P. THOMPSON & BOULT,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in or relating to Mezzotint or similar Engraving.
I, NOEL BYRON KENEALY, of Bushey Grove, Watford in the County of Herts.,
Artist, 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 copper steel or other plates at present employed in mezzotint engraving
have their surfaces "rocked" by a suitable "rocking" tool carrying a number of
sharp teeth each of which makes a small puncture on the surface of the plate. A
plate thus prepared is ready to receive the engraving on it which is done by
scraping the rocked surface off the plate at different parts to produce light and
shade.
This process necessitates the employment of a fresh "rocked" plate for each
picture and as the process of "rocking" involves considerable time and skill the
plates are expensive to produce and their employment in any large numbers is
prohibitive.
I propose by my present invention to overcome this difficulty and I prepare a
steel or copper or other metal plate with a rocked surface in the ordinary manner.
From this plate I obtain a mould or matrix either by electro-deposition or from
guttapercha or by any other suitable means and from this mould I obtain by
electro-deposition a metal plate having a rocked surface identical with that of the
original. Any number of these facsimile or substitute plates may be prepared and
their surfaces can then be scraped to produce the lights and shades of various
pictures. By this means I am enabled to produce at a nominal cost from the
original rocked plate any number of substitute plates from which pictures may be
engraved instead of having to employ a fresh original plate for each picture.

page_text: 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 1
claim is
In mezzotint engraving the employment of substitute rocked plates substantially
as described whereby the original rocked plate is preserved intact and may be used
over and over again.
CHIS
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1001.
NOEL B. KENEALY.
W. P. Thompson & Boult,
Agents for the Applicant.
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