Improvements in Photography by Means of Colored Glasses used in Combination with the Photographic Lens.
Year: 1892

page_text: Date of Application, 26th May, 1892
Complete Specification Left, 31st Jan., 1893—Accepted, 26th May, 1893
PROVISIONAL SPECIFICATION.
Improvements in Photography by Means of Colored Glasses used
in Combination with the Photographic Lens.
ARTHUR BURCHETT Willoughby Lodge 28 Willoughby Road Hampstead
London N.W. Artist do hereby declare the nature of this invention to be as
follows:-
Two colored glasses, green & yellow are placed inside the photographic lens tube
in such manner that the green glass is at the back of the front lens or combination
of front lenses & that the yellow glass is in front of the back lens or combination of
lenses.
The invention or improvement consists of the green & yellow glasses in com-
bination with the lens or lenses as described.
ليوم
זג
1000
ARTHUR BURCHETT.
COMPLETE SPECIFICATION.
Improvements in Photography by Means of Colored Glasses used
in Combination with the Photographic Lens.
ARTHUR BURCHETT 28 Willoughby Road Hampstead London N.W. Artist 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:
Two colored glasses, green & yellow are placed inside the tube of the photographic
lens, in such manner that the green glass is at the back of the front lens or com-
bination of lenses, with its surface parallel with the surface of the lens, & that the
yellow glass is in front of the back lens or combination of lenses with its surface
parallel with the surface of the lens.
I find that I can use transparent films colored similarily instead of glass but
prefer to use the two colored glasses named.
And the manner of working is, the two glasses having been placed in the lens
tube in the manner described the lens is attached to the photographic camera, & the
object or objects to be photographed focused in the ordinary manner. The sensitive
plate or film having been placed in a dark slide & attached to the photographic
camera, the exposure is made in the usual way & the plate or film is afterwards
developed in the dark room in the usual way.
By this invention or improvement I am enabled to photograph color much more
in its true relative value to black & white than by any other known method, and in
photographing from nature in landscape I am able by whatever exposure I give to
obtain on the sensitive plate or film a representation of whatever sky may be
present instead of as before by other methods a perfectly blank white representation
of the sky. And if the exposure has been correct the sky will be in its true
relative value in black & white to the landscape or seascape. For photographing
pictures or other colored objects the results given by this method are more correct
& the graduations of light & shade more true than by any other method. This
invention or improvement is suitable for every purpose that the ordinary leus is
used for, except instantaneous exposures, by preference I use isochromatic plates but
they are not absolutely necessary, but I find that they give better results than the
ordinary sensitive plate or film.

page_text: 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:
1st. The use of green & yellow glasses in combination with the photographic
lens in the manner described.
Dated this Fifteenth day of May 1893.
ARTHUR BURCHETT.