A Method of Altering the Corrections of an Eyepiece of the Huy- ghenian Type for use in Microscopes and other Scientific Instruments.
Year: 1899

page_text: Date of Application, 26th July, 1899
Complete Specification Left, 26th Apr., 1900-Accepted, 26th July, 1900
A Method of Altering the Corrections of an Eyepiece of the Huy-
ghenian Type for use in Microscopes and other Scientific Instruments.
I, FREDERICK WILLIAM WATSON BAKER, of 313, High Holborn, London, W.C.,
Optician, do hereby declare the nature of this invention to be as follows:-
In the ordinary Huyghenian eyepiece, the eye-lens, field-lens & diaphragm,
are each fixed to one tube & bear an exact relationship to each other. In my
new method, the eyepiece consists of a tube, carrying the eye lens & diaphragm
fixed in their correct relationship to one another.
The body of the eyepiece has the field lens fixed to its lower end, and the
said tube fits into the body by sliding, and the alteration of corrections is
effected by increasing or diminishing the distance between the eye-lens & the
field-lens a scale being engraved upon the said tube to register any desired
position.
T
1000
A Method of Altering the Corrections of an Eyepiece of the Huy-
ghenian Type for use in Microscopes and other Scientific Instruments.
I, FREDERICK WILLIAM WATSON BAKER, of 313, High Holborn, London, W.C.,
Optician, 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:--
The ordinary Huyghenian eyepiece is composed of two lenses, termed respec-
ively the eye lens, and the field-lens with a diaphragm in proper position
between them. They are mounted in a tube or tubes and have a fixed relation-
ship one to the other.
In my new method, the eyepiece consists of an outer tube, at the lower end of
which the field lens is fixed. An inner tube, carrying, at its upper end, the
eye-lens and a diaphragm fitted in its proper position in relation to the eye lens,
fits into the outer tube, and by altering the distances between the eye and field
lenses by closing or extending the inner tube, the chromatic corrections of the
eyepiece are varied to any desired extent.
The said closing or extending may be effected by the inner tube sliding into
the outer tube; by the inner tube screwing on or into the outer tube; by the inner
tube sliding into the outer tube with a twisting motion on a spiral slot & pin;
or by other convenient methods.

page_text: Further I engrave on the inner tube a divided scale by means of which effects
may be registered and reproduced.
The invention will be described with reference to the accompanying drawings
forming part of this specification wherein A is the outer tube, with the field
lens B fitted to it.
The inner sliding tube C carries the eye-lens D and the diaphragm E in its
proper position with reference to the said eye-lens. The divided scale F is
also shown.
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:-
-
In an eyepiece of the Huyghenian type for use in microscopes and other
scientific instruments, a means of varying the chromatic corrections by altering
the distances between the eye and field lenses, the diaphragm being maintained
in its proper position in relation to the eye lens, by means of tubes fitting one
into the other. The outer tube carrying the field lens and the inner tube carry-
ing the eye-lens and diaphragm. The position of the inner tube in relation to
the outer tube being varied either by a sliding fitting, a screw fitting, a spiral
slot & pin fitting or by other convenient methods.
Dated this 26th day of April 1900.