A Chromatic Shade Finder and Index for use in Colour Blending.
Year: 1899

page_text: Date of Application; 2nd May, 1899-Accepted, 1st July, 1899
COMPLETE SPECIFICATION.
A Chromatic Shade Finder and Index for use in Colour Blending.
I, GEORGE KEVEN HENDERSON, of 134, Second Street, Coshocton, in the County
of Coshocton and State of Ohio, United States of America, Lithographer, do hereby
declare the nature of this. invention and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following state-
ment:-
My invention relates to an apparatus for determining the proper proportions
of the primary colours in order to obtain any desired shade, and it has. for its
object the production of an apparatus which can by proper manipulation produce
any given shade by the combination of the three primary colours; namely; yellow,
red, and blue.
The invention consists in a combination of superposed colored discs, the two
uppermost being made of gelatine or equivalent translucent or. transparent
material the discs being mounted on a base, in such manner as to pass one over
the face of the other, the said base having a scale properly divided whereby to
give the proper proportion of each colour on the respective discs.
Reference is to be had to the accompanying drawing in which
Figure 1 is a plan view of the device embodying my invention.
Figures 2, 3, and 4 are views of the sheets or disks and
Figure 5 is a cross section of the device.
Referring to the drawing A, B, and C designate concentric circles secured to the
base of the device in any suitable manner, A being the outer circle. which gives
proportions of yellow, B the central circle giving the proportions of red, and C
the inner circle, giving the proportions of blue, each circle being graduated from
the one-hundredth part to the full strength of the colour used.
.
D, E and F represent the sheets, preferably in the form of disks mounted one
over the other on a common pivot on the base of the device. . 1), the yellow, being
located undermost; E, the red, being located centrally; and F, the blue, upper-
most. The yellow is imprinted on paper, the red and blue on celluloid, gelatine,
isinglass, mica, glass, or other transparent or translucent material that allows the
colours to blend or mix. The imprinting is accomplished by half tone, gelatine
printing, photolithography or other process.
G, H and I designate levers or handles attached to the several disks 1), E and F.
G is the longest lever- and corresponds with the outer circle around which it
rotates. H is the central lever or handle which corresponds with the central
circle around which it rotates. I is the shortest lever or handle, corresponding
with the inner circle, and around which it also rotates. These levers when moved
to give any given shade, rest on figures which give the proportions of colour or
colours required in blending or mixing the same. The uppermost figures on these
circles represent the proportion of colour to be used and the undermost figures
represent the proportion of reducing ink to be mixed with the same.
J represents the shade registering point at which the apparatus gives the desired
colour, the levers or handles indicating the proportions of colour by which it is

page_text: blended. These disks D, E and F are centrally pivoted to the frame work or
base of the apparatus and are rotated through the medium of the levers as aforesaid.
Each sheet or disk is graded from the lightest to the deepest shade of the colour
on it, and the arrows at the shade registering point indicate in what direction the
sheet, is to be moved by its handle in order to go from the lightest shade to the
full strength of the colour.
It is to be understood that I do not limit myself to the exact design and arrange-
ment of the parts shown in the accompanying drawing and described above, for
it is evident that I may make various changes without exceeding the scope of
the appended claims.
I also wish it understood that, while using the term "translucent" throughout
my claims, I do not limit myself to using a material for the sheets or disks which
is translucent merely, that is, not transparent; but the term "translucent" is to
be considered in its broadest sense, namely as meaning perspicuous, or capable of
being looked through.
It is obvious that the number of shades can be increased or diminished.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is:
1. A device of the character described, comprising a base, and contrasting,
colored, translucent sheets mounted upon said base, each of said sheets bearing
a plurality of shades of its respective colour graded from light to deep, as and
for the purpose set forth.
2. In a device of the character described, the combination of complementary-
colour bearing sheets mounted upon a base having a scale whereby to give the
proportion of the respective colours on the sheets to form a desired shade, as and
for the purpose set forth.
3. The combination of three sheets, each bearing shades of one of the com-
plementary colours and the outer and middle sheet being translucent, and a
circular scale concentric to said sheets, as and for the purpose set forth.
4. A device of the character described, comprising three superposed sheets
in the form of disks mounted concentrically, each of said disks bearing shades of
one of the complementary colours and the outer and middle disk being translucent,
a pointer attached to each disk, and a graduated circular scale concentric to said
disks as and for the purpose set forth.
5. A device of the character described, comprising three superposed sheets in
the form of disks mounted concentrically, each of said disks being colored with
shades of one of the complementary colours graded from light to deep, three
circular scales concentric to said disks and each graduated from a small amount
to the full strength of the respective colours on the disks, and a pointer attached
to each disk, each of said pointers being of such a length as to describe a circle
corresponding to the circular scale of the respective colour of the disk to which it
is attached, as and for the purpose set forth."
Dated this 2nd day of May 1899.
.A. M. & WM. CLARK,
Chartered Patent Agents.
53, Chancery Lane, London.