Improved Method of Engraving or otherwise Preparing Stone and like Surfaces to enable Electros, Stereos, and the like to be made.
Year: 1898

page_text: Date of Application, 1st July, 1898
Complete Specification Left, 30th Mar., 1899-Accepted, 13th May,
1899
Improved Method of Engraving or otherwise Preparing Stone and
like Surfaces to enable Electros, Stereos, and the like to be made.
I, EDWARD WILSON SMITH, of 16, Laurence Pountney Lane, Cannon Street,
London, Designer and Lithographer, do hereby declare the nature of this inven-
tion to be as follows:-
The object of this invention, is to prepare by engraving or otherwise the surface
of lithographic stone or similar material after the same has been printed upon,
er had the design transferred to it in the usual manner, so that electros, stereos,
and the like can be made of the design ready for being used in the printing press.
For the purpose of my invention, I take, say, a lithographic stone and draw or
transfer thereon a design in any of the well known manners. I then ink up the
stone in the usual manner to the degree required and cover it with powder
asphaltum, rubber, or other suitable material, which adheres to the inked portions,
the surplus being dusted off so as only to leave the inked parts covered.
I then take the stone to an apparatus from or in which sand or the like can be
expelled and forced against the surface of the stone to cut away or remove the
portions of the stone not covered or protected by the ink and the powdered sub-
stance, and so leave the design proper in relief, thereby enabling electros, stereos,
and the like to be made from the stone in the manner well known.
The depth of the engraved portion of the stone is determined by the openness
or closeness of the design as also is the degree of fineness and blast of the sand
to be employed, this blast being regulated in any suitable manner.
In engraving the stone by the sand, the stone is moved mechanically or by hand
close to the nozzle or orifice from which the sand is forced, and by so doing, the
sand cuts direct into the stone and not anglewise as it would if the stone were
at a distance away, thus all undercutting of the stone is prevented.
If desired to cut or engrave deeply, the stone may be cleaned and re-inked and
covered with the asphaltum or the like a number of times according to the degree
ef depth required, this being effected each time it is noticed that the sand is
destroying the protected inked parts, but for general work only the first inking
and protecting will be found necessary.
1 11
1
1
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1000
5 Improved Method of Engraving or otherwise Preparing Stone and
like Surfaces to enable Electros, Stereos, and the like to be made.
I, EDWARD WILSON SMITH, of 16, Laurence Pountney Lane, Cannon Street,
London, Designer and Lithographer, do hereby declare the nature of this inven-

page_text: tion 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 prepare by engraving or otherwise the surface
of lithographic stone, or similar material after the same has been drawn upon,
or had the design transferred to it in the usual manner, so that electros, stereos,
and the like can be made of the design ready for being used in the printing press.
For the purpose of my invention, I take, say, a lithographic stone and draw or
transfer thereon a design in any of the well known manners. I then ink up the
stone in the usual manner to the degree required and cover it with powder
asphaltum, rubber, or other suitable material in powder form which adheres to the
inked portions, the surplus being dusted off so as only to leave the inked parts
covered.
I then take the stone to an apparatus from or in which sand or the like can be
expelled and forced against the surface of the stone to cut away or remove the
portions of the stone not covered or protected by the ink and the powdered sub-
stance, and so leave the design proper in relief, thereby enabling electros, stereos,
and the like to be made from the stone in the manner well known,
The depth of the engraved portion of the stone is determined by the openness
or closeness of the design as also is the degree of fineness and blast of the sand
to be employed, this blast being regulated in any suitable manner.
In engraving the stone by the sand, the stone is moved mechanically or by hand
close to the nozzle or orifice from which the sand is forced, and by so doing, the
sand cuts direct into the stone and not ánglewise as it would if the stone were
at a distance away, thus all under cutting of the stone is obviated.
If desired to cut or engrave deeply, the stone may be cleaned and re-inked and
covered with the asphaltum or the like a number of times according to the degree
of depth required, this being effected each time it is noticed that the sand is
destroying the protected inked parts, but for general work only the first inking
and protecting will be found necessary.
Having now particularly described and ascertained the nature of the said
invention, and in what manner the same is to be performed, I declare that what
I claim is:-
1. Preparing the surface of lithographic stone and the like for engraving pur-
poses by the sand blast by first drawing or transferring the design on to such stone,
inking up the stone in the usual manner and covering the inked portions with
powder asphaltum, rubber, or other suitable material in powder form, substantially
as and in the manner and for the purpose described.
2. The improved method of engraving or otherwise preparing stone and like
surfaces to enable electros, stereos, and the like to be made, consisting of first
drawing or transferring the design on to the surface of the stone, inking up the
stone in the well known manner, covering the inked portions with powdered
asphaltum, rubber, or other suitable material in powder form, cutting away the
unprotected portions of the stone by a sand blast, and afterwards employing the
stone as the original pattern, for the production of electros, stercos, and the like,
substantially as set forth.
The 20th love of Mauch 1000
R. CORE GARDNER,
Patent Agent, 166, Fleet Street, London,
Agent for the said Edward Wilson Smith.