AN IMPROVED MICROSCOPE TO BE USED FOR EXHIBITING PHOTOGRAPHIC VIEWS AND PRODUCTIONS."
Year: 1860

page_text: LETTERS PATENT to Aené Prudent Patrice Dagron, of Paris, in the French
Empire, Photographer, for the Invention of "AN IMPROVED MICROSCOPE TO
BE USED FOR EXHIBITING PHOTOGRAPHIC VIEWS AND PRODUCTIONS."
PROVISIONAL SPECIFICATION left by the said Aené Prudent Patrice
Dagron at the Office of the Commissioners of Patents, with his Petition,
on the 28th March 1860.
I, AENÉ PRUDENT PATRICE DAGRON, of Paris, in the French Empire, Photo-
grapher, do hereby declare the nature of the said Invention for "AN IMPROVED
MICROSCOPE TO BE USED FOR EXHIBITING PHOTOGRAPHIC VIEWS AND PRODUCTIONS,"
to be as follows:-
This Invention relates to an improved construction of dwarf microscope, by
which it is adapted for making observations upon microscopic pictures, images,
insects, flowers, and objects generally, and consists in a peculiar arrangement
of the parts of which the said microscopic instrument is composed, thereby
reducing the instrument to so small a compass that it can be carried about in
the pocket, either in the form of a key, a pencil case, or be worn on the finger
as a ring, or it may be attached to any other small portable article or
ornament, for instance, by placing it on a pen or pencil holder or on any
article of office, library, or general use; the microscopic image enlarged thereby
may be a calendar or almanack, or other permanent commercial or domestic
reference as desired; the said improved microscope may also be used separate
from any of the above mentioned articles without losing its essential charac-

page_text: teristic property of displaying the image viewed thereby; the instrument may
be made in two different ways, that is to say, it may either be mounted in a
metal setting, or be merely of solid glass, independently of such said setting.
I now proceed to describe the different forms of construction of the said
improved microscope as follows:-I fix the microscopic eye-glass in a socket
placed in a tube or slide holder, said socket being surrounded by a ring by
which the said eye-glass is capable of being moved in the said socket, so as
to adjust the glass to the proper focus. The aforesaid socket is furnished
with a stud or pin which fits into an inclined notch formed in the tube of the
eye-glass; a slight movement thus suffices for regulating and adjusting the focus.
Other arrangements than the above may be used for regulating the focus; the
slide holder is formed movable and consists of two tubes which support the glass
on which the microscopic image to be viewed is placed; if desired another lens
may be interposed' between the eye-glass tube and the object glass; the glasses
may be either flat or convex and achromatic if desired; another form of micro-
scope constructed according to this Invention consists of a microscope of solid
glass. Instead of mounting the microscope in a metal setting as before stated,
said solid glass may be of a cylindrical form, rounded at both ends, or it may
be divided into two parts, one part serving for the eye-glass, and the other for
the object glass; the image to be viewed being placed between the two glasses,
may be fixed thereto by means of any suitable adhesive substance or material.
In adapting the microscope to a ring to be worn on the finger the stone or
centre ornament of the ring is made to open on a hinge, and the microscope
is fixed inside the lid, or cover of the hinged part. I thus obtain two systems
or modifications of miniature microscope, in which the image may be either
permanent or variable, one being mounted in a metallic setting the other
formed of solid glass. Either of these instruments furnished with a permanent
object may be set in any ornamental or useful article in order to make
scientific, artistic, or simple observations with or without stereoscopic effect as
may be desired.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Aené Prudent Patrice Dagron in the Great Seal Patent
Office on the 28th September 1860.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, AENÉ
PRUDENT PATRICE DAGRON, of Paris, in the French Empire, Photographer,
send greeting.

page_text: WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-eighth day of March, in the year of our
Lord. One thousand eight hundred and sixty, in the twenty-third year
of Her reign, did, for Herself, Her heirs and successors, give and grant
unto me, the said Aené Prudent Patrice Dagron, Her special licence that
I, the said Aené Prudent Patrice Dagron, my executors, administrators, and
assigns, or such others as I, the said Aené Prudent Patrice Dagron, my
executors, administrators, and assigns, should at any time agree with, and
no others, from time to time and at all times thereafter 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 "AN IMPROVED MICROSCOPE TO
BE USED FOR EXHIBITING PHOTOGRAPHIC VIEWS AND PRODUCTIONS," upon the con-
dition (amongst others) that I, the said Aené Prudent Patrice Dagron, 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 performed,
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 Aené Prudent Patrice Dagron, do
hereby declare the nature of the said Invention, and in what manner the
same is to be performed, to be particularly described and ascertained in
and by the following statement thereof, that is to say:―
This Invention relates to an improved construction of a dwarf microscope,
by which it is adapted for making observations upon microscopic pictures,
insects, flowers, and objects generally, and consists of a peculiar arrangement
of the parts of which the said instrument is composed and reduced to so small
a compass that it can be applied to a ring, key, pencil case, toy, or any other
portable article or ornament. For instance, by placing it on a penholder,
pencil case, or any article of office furniture or jewellery, the microscopic image
being either an almanack or other permanent commercial or domestic article
of reference.
The said improved microscope may be also used independent of the above-
mentioned articles without losing its characteristic properties. The instrument
may be made in two different ways, that is to say, it can be mounted either in
metal or glass.
I now proceed to describe the different forms of construction of the said
microscope, which can be made for viewing one image or several images, as

page_text: may be required, as follows:-First, as regards the improved microscope for
viewing one image, the same is exhibited by the accompanying Sheet of
Drawings at Figures 1, 2, 3, 4, 5, mounted in metal, and independent of any
other article. To better understand the details, the microscope is shewn on a
larger scale in Figures 6 and 7, as applied to a watch key at Figures 8 and 9.
In this application the socket a is formed with a ring b, and receives the tube
c; d is an eye-glass adjusted by a groove in the socket a, so as to fix the glass
to the proper focus. The socket a has a pin f, which fastens in a notch g to
the eye-glass d, by means of which a rotatory movement of the eye-glass d can
be regulated; other methods, either circular or rectilinear, may be adapted for
adjusting the focus. The slide holder e is moveable, and consists of two tubes,
which support the glass i, in which the microscopic image is to be placed. The
eye-glass d, as well as the slide holder e, is joined by a screw on the socket a.
The image can be positive, direct, or on paper. Between the ocular and the
objective may be introduced another lens, which can be plain, convex, or
achromatic.
I now proceed to describe the construction of my improved microscope in solid
glass, as follows:-Microscopes in solid glass are represented by different views,
and of different dimensions, in Figures 10, 11, 12, and 13, of the accompanying
Sheet of Drawings. They are composed of solid glass of a cylindrical form,
rounded off at each end, or the solid glass can be subdivided in two parts h, h'.
The part h constitutes the eye-glass, and the part of the object glass. It is
between these two solid glasses that the image is placed l. This image is
glued on the inside face of the objective h', after which the objective h¹ and
the eye-glass h are equally joined together. An application of this microscope
is shewn as applied to a ring, see Figures 14, 15, 16. The stone m of the
ring opens on a hinge, and the inside of the cover fits the miscroscope h. By
this means I have two systems or modifications of the dwarf miscroscope in
which the image may be permanent or variable, one being mounted in metal,
the other in solid glass. It is either of these instruments furnished with a per-
manent object that I set on jewellery, furniture, &c., so as to obtain artistic or
useful observations with or without stereoscopic effect.
I next proceed to describe a double image microscope, constructed according
to this Invention, as follows:-I arrange the instrument with a double image,
in such a manner that the observations can be promiscuously made at one
extremity or the other of the miscroscope, so as to present two different
subjects. To obtain this double result it is necessary to confine the light to
the extent of the subject.
This new method of constructing the instrument with two images is exhibited

page_text: at Figures 17, 18, 19, and 20, of the accompanying Drawings; Figure 17
represents on a large scale the exterior of the microscope with a double image;
Figure 18 is a longitudinal section; Figures 19 and 20, the details of one of
the parts composing the instrument. The said instrument is composed of a
frame or cylinder a to receive the eye-glasses, which are fastened at each end
by screws b, ; the glasses c, c', have each a different image. The image only
occupies the centre of the glass to which it is made fast, so that the visual rays
only extend round the first image in order to give light to the second image.
Having now fully described and set forth the nature and object of my said
Invention of "An Improved Microscope to be used for Exhibiting Photographic
Views and Productions," together with the best means I am acquainted with
for carrying the same into practical effect, I hereby declare my Invention to
consist in, and I claim, a dwarf microscope of the construction above par-
ticularly described and represented by the accompanying Drawings, for the
purposes set forth.
In witness whereof, I, the said Aené Prudent Patrice Dagron, have
hereunto set my hand and seal, this Eighteenth day of September,
in the year of our Lord One thousand eight hundred and sixty.
Witness,
E. JAMNE, Ing. Civil,
25, Rue des Ecousse,
à Paris.
R. P. P. DAGRON. (L.S.)