Secret Printing or Writing which can be Reproduced by Various Methods.
Year: 1889

page_text: Date of Application, 16th Apr., 1889
Complete Specification Left, 19th June., 1889-Accepted, 27th July, 1889
PROVISIONAL SPECIFICATION.
Secret Printing or Writing which can be Reproduced by Various
Methods.
I JOSEPH ADAIR of Egremont in the County of Cumberland mine owner do hereby
declare the nature of this invention to be as follows:-
The printing or writing is of such a kind as to appear of the ordinary letter press,
lithographic or other kind of printing, and when held at the usual focal reading
distance from the eyes nothing but the words of the writing or printing is observed
but when the printed sheet is placed beyond the reading focus of the eyes and the
words of the printing are lost in obscurity, then other words or sonie design is seen on
the sheet which could not be discerned when the letter press was within reading
distance of the eyes.
The effect is produced by a thickening or thinning of the faces of the letters, by
the use of thinner faced type or by spacing out in the printing or by the use of
different shades or colours of ink either in the letters or in the ground, or by a
combination of these processes or a part of them.
The invention may be further described as Crypto graphic printing for the reason
that the ultimate design is hidden or unseen in the ordinary lithographic or other
printing with which the sheet is covered and is only visible when the sheet is removed
to a distance from the spectator.
The printed words are so slightly altered from the ordinary form that the differences do
not attract attention, for the reader does not observe the delicate thickening or thinning
of the lines of the letters which produce the effect desired, but when the sheet is
removed so far from the eyes that the letters and words are indistinct then the
alterations (though very slight individually) produce collectively a word or motto or
a pictorial design as may be desired, in the body of the printed sheet, which was before
hidden and invisible.
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COMPLETE SPECIFICATION.
Secret Printing or Writing which can be Reproduced by Various
Methods.
I JOSEPH ADAIR of Egremont in the County of Cumberland, mine owner 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 printing or writing is of such a kind as to appear of the ordinary letter press
or lithographic or other kind of printing, and when held at the usual focal reading
distance from the eyes nothing but the words of the writing or printing is observed
but when the printed sheet is placed beyond the reading focus of the eyes and the
words of the printing are lost in obscurity then other words or some design becomes
apparent in the midst of the writing which could not be discerned when the letter
press was within reading distance of the eyes.
The invention may be further described as Crypto graphic printing for the reason
that the ultimate design is hidden or unseen in the ordinary lithographic or other
printing with which the sheet is covered and is only visible when the sheet is
removed to a distance from the spectator.
The printed words are so slightly altered from the ordinary form that the differences
do not attract attention for the reader does not observe the delicate thickening or
D

page_text: thinning of the lines of the letters which produces the effect desired but when the sheet
is removed so far from the eyes that the letters and words are indistinct then the
alterations (though very slight individually) produce collectively a word or motto or
a pictorial design as may be desired in the body of the printed sheet which was before
hidden or invisible.
The effect is produced by a thickening or thinning of the letters, or by the use of
thinner faced type or by spacing out in the printing or by the use of different shades
or colours of ink, either in the letters or in the ground or by a combination of these
processes or a part of them.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is the following new feature.
That the printed lithographed or engraved writing or printing by whatever process
it is reproduced is so contrived that when it is viewed in the usual manner at the
reading distance from the eyes appears to be simply ordinary lithographed writing or
printed matter, but when it is removed beyond the reading focus of the eyes then a
secret or hidden design of some kind or. some word or words appear in the body of
the printed matter which were before unseen and their presence unsuspected.
Dated this 18th day of June 1889.
JOSEPH ADAIR.