An Improved Process of Engraving by Sand Blast.
Year: 1888

page_text: Date of Application, 24th Sept., 1888
Complete Specification Left, 24th June, 1889-Accepted, 3rd Aug., 1889
PROVISIONAL SPECIFICATION.
An Improved Process of Engraving by Sand Blast.
A communication from CESAR FELIX Josz, of Vilvorde, in the Kingdom of Belgium,
Engineer.
I, ALFRED JULIUS. BOULT of 323 High Holborn, in the County of Middlesex,
M.I.M.E., do hereby declare the nature of this invention to be as follows:-
With the present process of. engraving by sand-blast in combination with litho-or
typographic impression, any kind of inscription or subject may be reproduced on
metal or other plates and formed partly by the polished surface, partly by different
degrees of dead or dull surface and partly by impression.
The process is as follows:-
From a litho-graphic stone or other engraved surface, an imprint is taken on a
polished metal or other surface by means of a fatty, elastic and rapidly drying ink.
This surface is now exposed to a sand blast, when the parts covered with the elastic
ink will be protected while the exposed parts of the surface will become dead or dull.
If it is required to graduate the dead or dull parts, any desired parts of these after a
little time are covered with the elastic ink and thus an infinite graduation may be
effected. The ink is then removed, the surface washed and cleansed when the design
or inscription will stand out highly polished on a graduated or non-graduated dead
or dull ground. The surface may be further improved or embellished with details,
ornaments and the like, and if the process is employed with metal plates they will
produce brilliant and entirely novel advertisement boards for instance.
Dated this 24th day of September 1888.
COMPLETE SPECIFICATION.
An Improved Process of Engraving by Sand Blast.
A communication from CÉSAR FÉLIX Josz, of Vilvorde, in the Kingdom of Belgium,
Engineer.
I, ALFRED JULIUS BOULT of 323 High Holborn in the County of Middlesex,
M.I.M.E., 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:―
With the process forming the subject of the present application any inscription or
subject can be produced with partly polished partly dead surfaces, the dead being in
different shades or degrees if desired.
The operation is as follows:-
From a lithographic stone an engraved plate or other engraved surface is taken an
impression on a polished or other metal surface by means of an ink composed of
elastic quickly drying materials. This surface is then exposed to the effects of the
sand blast by means of which the exposed parts of the surface become dead or dull
while those protected by the aforesaid ink are not affected. If after a few instants of
subjecting the surface to the sand blast some parts of the slightly dull surface are
covered with similar ink either by hand or by a fresh impression and the surface again
subjected to the effects of the sand blast surfaces of different degrees of dulness are
produced. The same operation may be repeated several times. The ink is then
removed and the surface washed and cleaned showing the subject in partly highly
polished partly dead surfaces the dead being in several degrees or shades.

page_text: The surface may now be further ornamented.
This process is especially adapted for metallic advertisement plates and gives these a
brilliant and entirely new appearance.
Having now particularly described and ascertained the nature of the said inven
tion and in what manner the same is to be performed as communicated to me by
my foreign correspondent I declare that what I claim is ;-
1. The method or process of engraving by sand blast substantially as specified.
2. A sand blast engraving produced substantially as specified.
1000
W. P. THOMPSON & BOULT,
Agents.