Year: 1888

page_text: I, CHARLES SAMUEL RAE of Allesley Coventry in the County of Warwick,
Optician do hereby declare the nature of my said invention to be as follows :-
My invention has for its object an improved microscope which from its simplicity is
particularly adapted for school use and by which I am enabled to obtain the best effect
at the lowest cost, as well as by means of the square form employed obviate the
radiation of the rays of light. My invention consists of a square metal tube having at
one end a square cap socetted into the same which cap has a small circular aperture in
the end against the sides of which the lens rest.
The lens which is in the shape of a ball is provided with a projecting piece of
wire which obviates the defect necessary in the manufacture and forms an arm
which helps to steady the lens in position. To fix the lens in the desired
position against the aperture in the cap a metal plate which is turned over
at the edges and having a similar aperture to the cap is forced down inside
the cap until it butts against the lens, both apertures being slightly smaller than
the lens, the lens by this means is effectively retained in position between the two.
The object glass which is of a size to fit the cap is passed down the cap until it
meets the lens in which position it is fixed by a second tube which is made to fit
the inside of the cap socket tightly and is forced therein until it presses the object
glass in its place.
In cases where a live box is necessary a square piece of metal having a square
aperture in the centre is placed next to the object glass and a second piece of
glass is placed against that, and the whole kept in place by the second tube as.
before so that the aperture in the thickness of the metal between the glasses forms
a box for-live objects:
In the other end of the main tube I place a cap having a small square hole which
forms a diaphragm or condenser for condensing the light and I may use one or more
of these within the tube itself so as to allow of modifying the light to suit special
circumstances.
Dated this 21st day of November 1888.
GEORGE BARKER,
77, Colmore Row, Birmingham,
Agent for Applicant.

page_text: I CHARLES SAMUEL RAE of Allesley, Coventry in the County of Warwick,
Optician, do hereby declare the nature of my said invention to be as follows:-
My invention has for its object an improved microscope, which from its simplicity
is particularly adapted for school use and by which I am enabled to obtain the best
effect at the lowest cost, as well as by means of the square form employed to obviate
any radiation of the rays of light.
My invention consists of a square metal tube having at one end a square cap
socketed into the same which cap has a small circular aperture in the end against
the sides of which the lens rests. The lens which is in the shape of a ball is
provided with a projecting piece of wire which obviates the defect necessary in the
manufacture and forms an arm which helps to steady the lens in position. To fix
the lens in the desired position against the aperture in the cap a metal plate which
is turned over at the edges and having a similar aperture to the cap is forced down
inside the cap until it butts against the lens both apertures being slightly smaller
than the lens, the lens by this means is effectively retained in position between
the two. The object slide upon which the object is mounted and which is of a size
to fit the cap is passed down the cap until it meets the lens in which position it is
fixed by a second tube which is made to the inside of the cap socket tightly
and is forced therein until it presses the object slide in its place. In cases where
a live box is necessary a square piece of metal having a square aperture in the
centre is placed next to the object slide, and a second piece of glass placed against
that, and the whole held in place by the second tube as before so that the aperture
in the thickness of the metal between the glasses forms a box for live objects. In the
other end of the main tube I place à cap having a small square hole which forms a
diaphragm or condenser for condensing the light and I may use one or more of these
within the tube itself so as to allow of modifying the light to suit special
circumstances.
In order that my invention may be clearly understood and more easily carried into
practice I have appended hereunto a double sized sheet of drawings upon which I
have shewn two examples of the mode in which I construct my improved microscope.
Figure 1 is a horizontal section through one of my microscopes when fitted ready
for use.
Figure 2. is an end elevation of the head.
Figure 3. is an end elevation of the external concentrator.
Figure 4. is a view of the body A of the microscope with the head B and external
concentrator removed.
Figure 5 is a view of the external concentrator separated from the body A.
Figure 6 is a view of the head B separated from the body A.
Figure 7 is a horizontal section shewing a modification in the arrangement of the
parts as will be hereafter described..

page_text: My invention consists of the square metal tube A which forms the body of the
microscope and having at one end the square cap B which is socketted into the body A
and provided at the end with the aperture against the sides 6¹ of which the lens D
rests. This lens D which is spherical in shape is provided with the projecting piece of
wire which not only fills up a slight hole thereby obviating a defect caused by the
manufacture of these lenses but also forms an arm which helps to steady the lens D in
position.
To fix the lens against the sides 61 of the aperture in the cap B the metal plate E
which is turned over at the edges el and is provided with a similar aperture to the one
in the cap is forced down inside the cap B until it butts against the lens D and as both
the apertures are slightly smaller than the lens, the lens by this means is effectively
retained in position between the end B and the plate E.
The object slide F which is of a size to fit the cap E is passed down the cap until it
meets the lens D after which the distance piece K having the aperture ¹ in the centre
to form a live object cage is placed therein. A second piece of glass M being then
placed against that, and the whole kept in place by the second tube N which is made
to fit the inside of the cap B tightly.
In cases where the live cage is not necessary the distance piece K and second glass M
is not required and the second tube N is forced against the object slide F.
At the other end of the body A I place the cap P having the small square
hole P¹ which forms an external concentrator of the natural light only to be used
by daylight and I may use further concentrators R within the tube itself so as to
allow of modifying the light to suit special circumstances or I may use several
glasses in the head B between the object slide F and the lens D for correctly focussing
the object slide F. In cases where pressure upon the object may be required for
the purpose of aiding the circulation I make the body A to enter the head B in
place of the second tube N as shown by Figure 7 the pressure of the body against
the object slide F. in the head effecting the required result.
I may alter the details in many ways without departing from the principal of
my invention for although I prefer the body A to be square in shape yet
make it round or polygonal with possibly less satisfactory results.
may
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed what I claim is :
--
An improved microscope consisting of the various parts substantially as and for the
purpose herein set forth and shewn upon the drawings.
Dated this 1st March 1889
GEORGE BARKER,
77, Colmore Row, Birmingham,
Agent for Applicant.