A NEW PROCESS FOR THE PRODUCTION OF A SUBSTITUTE FOR LITHOGRAPHIC STONES
Year: 1883

page_text: LETTERS PATENT to Herbert John Haddan, of Kensington, Middlesex for an
Invention of A NEW PROCESS FOR THE PRODUCTION OF A SUBSTITUTE FOR
LITHOGRAPHIC STONES a communication to him from abroad by Peter Corfitz
Möller, of Leipzig, in the kingdom of Saxony
PROVISIONAL SPECIFICATION left by the said Herbert John Haddan at the
Office of the Commissioners of Patents on the 7th June 1883.
HERBERT JOHN HADDAN, of Kensington, Middlesex, "A NEW PROCESS FOR
THE PRODUCTION OF A SUBSTITUTE FOR LITHOGRAPHIC STONES," a communication
to me from abroad by Peter Corfitz Möller, of Leipzig, in the kingdom of Saxony,
This invention has for its object to produce a good and cheap substitute for
ordinary or natural lithographic stones by obtaining on a metal plate a layer of
stoney material resembling the natural lithographic stone, which layer is applicable
for the reproduction of typographic lithographic or copper plate prints, as well for
direct drawing and etching.
For this purpose slaked lime (hydrate of lime) is added to a water bath until the
lime is in excess, after which carbonic acid is introduced into the bath until an acid
re-action takes place.
In this manner a saturated solution of bicarbonate of lime is obtained which is
drawn off from the remaining undissolved slaked lime as a clear liquid.
With the solution of lime thus obtained a well cleaned metal plate is moistened
for instance by sprinkling the solution over the metal plate in the shape of a
drizzling rain.
Subsequently the metal plate is heated, however, only to such a degree as to
prevent the formation of spheroidal drops.
By thus moistening the inetal surface at suitable intervals and evaporating the
liquid, a firmly adhering deposit of lime-stone is gradually created on the surface
of the metal plate which, thus treated, possesses all the qualities required for the
application of the lithographic process so as to form a good and cheap material for
replacing the lithographic stones hitherto used.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Herbert John Haddan in the Great Seal Patent Office on the
5th December 1883.
HERBERT JOHN HADDAN, of Kensington, Middlesex "A NEW PROCESS FOR
THE PRODUCTION OF A SUBSTITUTE FOR LITHOGRAPHIC STONES," a communication
to me from abroad by Peter Corfitz Möller, of Leipzig, in the kingdom of Saxony,
This invention has for its object to obtain a good and cheap substitute for
ordinary or natural lithographic stone by producing on a metal plate a layer of
stony material resembling the natural lithographic stone, which layer is applicable
to the reproduction of typographic, lithographic or copperplate prints, as well as
for drawing and etching.
For this purpose slaked lime is added to a water bath until the latter contains an
excess of lime, after which carbonic acid is introduced into the bath until the latter
becomes slightly acid. The saturated solution of bicarbonate of lime thus obtained
is drawn off as a clear liquid from the undissolved slaked lime contained in the
bath.
With the solution of lime produced as described or in any other suitable manner
a well cleaned metal plate is moistened, for instance by sprinkling the solution over
the metal plate in the shape of a spray. Subsequently the metal plate is licated
to a degree somewhat less than would be sufficient for the formation of spheroidal
drops.
By thus repeatedly moistening the metal plate and by the evaporation of the
liquid at suitable intervals a firmly adhering deposit of lime-stone is gradually
produced on the metallic surface. The metal thus provided with a calcareous
deposit possesses the qualities required for the lithographic process, so as to form a
good and cheap substitute for natural lithographic stones hitherto used.
Having now described the invention, as communicated to me by the said Peter
Corfitz Möller, and in what manner the same is to be performed, I wish it to be
understood, that I claim :
Producing on a metallic surface a calcareous deposit by repeated moistening with
a solution of bicarbonate of lime and evaporation by heat, substantially as and for
the purpose described
In Witness whereof, I, the said Herbert John Haddan have hereunto set my
hand and seal this 5th day of December A.D. 1883.
TT T TTADDY LAY
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