IMPROVEMENTS IN INSTRUMENTS AND APPARATUS APPLICABLE TO PHOTO- GRAPHIC PURPOSES
Year: 1858

page_text: LETTERS PATENT to Eugene Derogy, of No. 33, Quai de l'Horloge, Paris,
in the Empire of France, Manufacturing Optician, for the Invention of
"IMPROVEMENTS IN INSTRUMENTS AND APPARATUS APPLICABLE TO PHOTO-
GRAPHIC PURPOSES."
Sealed the 13th July 1858, and dated the 20th April 1858.
PROVISIONAL SPECIFICATION left by the said Eugene Derogy at the
Office of the Commissioners of Patents, with his Petition, on the
20th April 1858.
I, EUGENE DEROGY, of No. 33, Quai de l'Horloge, Paris, in the Empire of
France, Manufacturing Optician, do hereby declare the nature of the said
Invention for "IMPROVEMENTS IN INSTRUMENTS AND APPARATUS APPLICABLE TO
PHOTOGRAPHIC PURPOSES," to be as follows:-
This Invention consists of a new system and combination of mountings,
optical instruments, and apparatus for obtaining photographic representations,
such mountings and apparatus having the form of a tube or cylinder either of
brass or other metal, into which are fitted divergent and convergent achro-
matic lenses, and which tube or cylinder is screwed or affixed to the front of
the camera obscura, and is similar in form and shape to the metal tube or
cylinder in general use for obtaining photographic representations.
This apparatus is so contrived that by simple and easy movements, adjust-
ments, arrangements, and re-arrangements of the different parts thereof, and

page_text: the lenses in connexion therewith, I am enabled to obtain and perform the
same results in taking portraits, views, and representations of objects which
now require the powers and use of at least three seperate instruments or sets of
apparatus (that is to say), with the apparatus constructed on a three-inch scale
to take or obtain productions of the same size as are obtained with and by
means of a four-inch apparatus. Also to take or obtain portraits, views, and
other representations of every description, and either on a larger or smaller
scale by lengthening or shortening the focus. And also to take or obtain
portraits, views, and representations of any object instantaneously.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Eugene Derogy in the Great Seal Patent Office on the
20th October 1858.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, EUGENE
DEROGY, of No. 33, Quai de l'Horloge, Paris, in the Empire of France, Manu-
facturing Optician, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twentieth day of April, in the year of our Lord One
thousand eight hundred and fifty-eight, in the twenty-first year of Her reign,
did, for Herself, Her heirs and successors, give and grant unto me, the
said Eugene Derogy, Her special licence that I, the said Eugene Derogy,
my executors, administrators, and assigns, or such others as I, the said
Eugene Derogy, my executors, administrators, and assigns, should at any
time agree with, and no others, from time to time and at all times there-
after during the term therein expressed, should and lawfully might make, use,
exercise, and vend, within the United Kingdom of Great Britain and Ireland,
the Channel Islands, and Isle of Man, an Invention for "IMPROVEMENTS
IN INSTRUMENTS AND APPARATUS APPLICABLE TO PHOTOGRAPHIC PURPOSES," upon
the condition (amongst others) that I, the said Eugene Derogy, my executors
or administrators, by an instrument in writing under my, or their, or
one of their hands and seals, should particularly describe and ascertain the
nature of the said Invention, and in what manner the same was to be per-
formed, and cause the same to be filed in the Great Seal Patent Office within
six calendar months next and immediately after the date of the said Letters
Patent.
NOW KNOW YE, that I, the said Eugene Derogy, do hereby declare.
the nature of my said Invention, and in what manner the same is to be

page_text: performed, to be particularly described and ascertained in and by the
following statement:-
This Invention consists of a new system and combination of mountings,
optical instruments, and apparatus for obtaining photographic representations,
such mountings and apparatus having the form of a tube or cylinder either of
brass or other metal, into which are fitted divergent and convergent achro-
matic lenses, and which tube or cylinder is screwed or affixed to the front of
the camera obscura, and is similar in form and shape to the metal tube or
cylinder in general use for obtaining photographic representations.
This apparatus is so contrived that by simple and easy movements, adjust-
ments, arrangements, and re-arrangements of the different parts thereof, and
the lenses in connexion therewith, I am enabled to obtain and perform the
same results in taking portraits, views, and representations of objects which now
require the powers and use of at least 3 separate instruments or sets of
apparatus, that is to say, with the apparatus constructed on a 3-inch scale to
take or obtain productions of the same size as are now obtained with and by
means of a 4-inch apparatus. Also to take or obtain portraits, views, and other
representations of every description, and either on a larger or smaller scale
by lengthening or shortening the focus. And also to take and obtain portraits,
views, and representations of any object instantaneously.
In order, however, that my Invention may be fully understood and readily
carried into effect, I will proceed to describe by the aid of the accompanying
Drawings, first, the general arrangement and construction of the apparatus in
the several parts of which it is composed, and, secondly, the manner in which
the apparatus is intended to be used.
CONSTRUCTION OF THE APPARATUS AS SHEWN IN THE DRAWINGS.
Fig. 1 is a longitudinal elevation shewing the apparatus as when in use, fixed
upon the camera. The other Figures are different portions of the apparatus
detached. The same letters of reference indicate the corresponding parts in
the several Figures. a is a cell containing a lens; 6 is a flange or rim serving
to fix the apparatus upon the camera; c is a rack and pinion movement; dis
a tube; e is a cell and diaphragm holder, shewn separately, Fig. 2; f is a sun
shade that always remains fixed upon the cell and diaphragm holder e; g is a cap
covering the sun shadef and the exterior end of the tube d; h (Fig. 2) is a cell
containing a lens that the operations do not require to be moved; i (Fig. 2) is
where the two small extra cells, Figs. 4 & 5, each containing a lens, are
successively placed when required, as well as the diaphragms, which are fixed
by the aid of the ring, Fig. 3; Fig. 6 shews the interior of the cap g.

page_text: When portraits are to be taken, I place by bayonet movement the cell a in
the end of the tube d that is inserted in the camera. I then place also by
bayonet movement the cell and diaphragm holder e, to which is fixed the cell h
and the sun shade f in the exterior end of the tube d, and operate in the usual
manner.
When portraits are to be taken of a smaller size than those obtained by the
foregoing combination, I place, by bayonet movement, in the end i of the cell
and diaphragm holder e, the small extra cell, Fig. 5.
When portraits are to be taken of a larger size than those obtained by the
above portrait combinations, I substitute the small extra cell, Fig. 5, for the
one, Fig. 4.
When views or reproductions are to be taken, I place the required diaphragm
in the end of the cell and diaphragm holder e, provided with the cell h and
the sun shade f; I then place the said cell and diaphragm holder into the end
of the tube d that is inserted in the camera, in which case the cap g covers
the exterior end of the tube d.
When views or reproductions are to be taken of a smaller size than those
obtained by the foregoing combination, I place in the end i of the cell and
diaphragm holder e the small extra cell, Fig. 5.
When views or reproductions are to be taken of a larger size than those
obtained by the above view combinations, I substitute the small extra cell,
Fig. 5, for the one Fig. 4, and place the cell and diaphragm holder e into the
exterior end of the tube d.
Having thus described the nature of my Invention and the manner in
which the same is to be performed, I would have it understood that I do
not mean or intend to confine myself to the precise forms and arrangements of
the parts represented and described; I would also remark that altho' I have
found it necessary for the sake of making evident the mode of construction and
using my improved apparatus, to describe at the same time several well-known
parts of photographic apparatus, yet I do not claim such parts as of my
Invention; but I do claim as of my Invention,-
Firstly, the construction of the apparatus so that the tube d and the cell and
diaphragm holder e form one tube divisable into 2 parts, and the construction
of the cell and diaphragm holder e, and the capability of placing the same at
either end of the tube d, which together serves as a foundation for a combi-
nation and attainment of photographic results, whereby my apparatus takes
the place and embodies the powers of several instruments.

page_text: Secondly, the placing by the aid of the cell and diaphragm holder e certain
lenses and diaphragms in the centre of the tube d from either end of the said
tube.
Thirdly, the cap g covering the sun shade f and the exterior end of the
tube d when the cell and diaphragm holder e with the sun shade is placed
in the end of the tube d, that is inserted in the camera.
Fourthly, the application of the bayonet movement in my apparatus hitherto
not made use of in photographic apparatus.
Fifthly, the combination of ten foci in my apparatus.
In witness whereof, I, the said Eugene Derogy, have hereunto set my
hand and seal, this Twentieth day of October, in the year of our Lord
One thousand eight hundred and fifty-eight.
Witness,
C. P. CHAPMAN,
20, Rue de la Sourdiere,
Paris.
EUGENE DEROGY. (L.S.)