RESERVE Lithographing and Zincographing by Means of Sand-blast.
Year: 1888

page_text: Date of Application, 21st Sept., 1888
Specification Accepted, 26th Oct., 1888
RESERVE
Lithographing and Zincographing by Means of Sand-blast.
I, JOSEPH LEWIS MILLS, of Baldwin's Gardens, Gray's Inn Road in the County
of Middlesex Art color-printer 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:-
This Invention, in so far as it relates to Lithography is an addition to the
invention described in my Specification for Letters Patent dated 16th September 1887,
No. 12581. In carrying it into practice for lithography I coat the entire lithographic
stone with gum or any other suitable non-greasy substance of a suitable thickness
upon which, when dry, I place a tracing of the picture which I desire to engrave on
the lithographic stone. I then by directing the sand blast by means of the instrument
or apparatus described in my Specification for Letters Patent No. 10,29588 puncture
the gum or other suitable non-greasy substance in an artistic manner until such time
as the whole of the tracing and light and shade appear punctured or perforated
through the gum or non-greasy substance and into the stone. After this I pour over
the surface of the stone so coated and punctured, as aforesaid lithographic grease, or
litho ink, or any other suitable lithographic substance thus impregnating such
punctures with said ink or substance. Lastly I wash off with water the gum or other
non-greasy substance which is on the surface of the lithographic stone, and roll up,
and etch in the ordinary way. This I term the reverse process of producing what I
terin Lithographic Type.
For Zincography 1 engrave on the zinc plate the subject picture or design by the
means of sand, emery powder, glass powder or such other like substance impelled
against the surface to be operated upon by a current of compressed air (or steam
when greater impact is required) issuing from the point or nozzle of the instrument
or apparatus herein before mentioned or by any other instrument, or apparatus now
known wherewith the process known as "sand-blast" can be applied for zincographing,
and afterwards I pass the printing roller charged with the ink over the surface of said
plate, imbuing or impregnating only the parts, of such surface which has not been
engraved, and leaving the engraved or sunken parts untouched and so creating any
desired printing surface. I either direct the sand-blast to the plain plate first and

page_text: charge the surface with litho' ink, grease, asphalt, or other suitable medium afterwards,
or I charge the plate with litho' ink, grease, asphalt, or other suitable medium first,
and direct the sand-blast on the zincographic surface afterwards thereby removing
such surface in places where it is not required. For zincography I also proceed as
follows. I coat the entire zinc plate, with gum or any other suitable non-greasy
substance of a suitable thickness upon which, when dry, I place a tracing of the
picture which I desire to engrave on the plate. I then by directing the sand-blast
by means of the instrument or apparatus hereinbefore mentioned puncture the gum,
or other suitable non-greasy substance in an artistic manner until such time as the
whole of the tracing and light and shade appear punctured, or perforated through the
gum or other non-greasy substance and into the plate. After this I pour over the
surface of the plate so coated and punctured, as, aforesaid lithographic grease, or
litho' ink, or any suitable lithographic substance thus impregnating such punctures,
with said ink, or substance. Lastly I wash off with water the gum or other non-
greasy substance which is, on the surface of the plate and roll up, and etch with the
necessary modifications in the material used for the etching of the work.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I claim.
1-The process and means for lithographing hereinbefore described.
2--The process and means for zincographing herein before mentioned.
Dated this 20th day of Santambor 1000