Improved Object Lenses for Binocular Telescopes, Opera, Field, and like Glasses.
Year: 1895

page_text: Date of Application, 28th Nov., 1895
Complete Specification Left, 17th July, 1896-Accepted, 5th Sept., 1896
PROVISIONAL SPECIFICATION.
Improved Object Lenses for Binocular Telescopes, Opera, Field, and
like Glasses.
I, JULES KAIL, of 95 Boulevard Beaumarchais, Paris, in the Republic of
France, do hereby declare the nature of this invention to be as follows:-
In the manufacture of binocular telescopes, opera glasses, field glasses and the
like, the size of the object lenses is limited by the distance between the eyes. Even
where the glasses happen to be tangential, their maximum diameter would still be
limited by the distance at which the eyes are apart.
Now the object glasses or lenses of the improved construction hereinafter described
enables the maximum diameter of the present objectives to be increased within
much wider limits than hitherto.
In carrying out my invention I take object lenses, either achromatized or not, of
a diameter larger than the distance between the eyes, and I cut their edges in the
shape of a segment of a circle and at such a distance from the centre that, if the
two lenses be moved nearer to each other along the line of the cut, the centres of
the lenses will be separated from each other by a space equal to that at which the
eyes are placed apart.
It will be understood that I have done away with only a small portion of the
edges of the lenses and, by so doing, have realized all the advantages resulting
from the employment of large object glasses, without resorting to any complicated
construction.
Notwithstanding the slight deformation of the optical field, its value may be
augmented, or the clearness or magnifying power may be increased in any desired
proportions. Any existing oculars or eye pieces may be employed in connection
with these improved object lenses without requiring any alteration.
AT
11005
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.
Improved Object Lenses for Binocular Telescopes, Opera, Field, and
like Glasses.
I, JULES KAIL of 95 Boulevard Beaumarchais, Paris, in the Republic of
France, Optical Engineer, 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:-
In the manufacture of binocular telescopes, opera glasses, field glasses and the
like, the size of the object lenses is limited by the distance between the eyes. Even
where the glasses happen to be tangential, their maximum diameter would still be
limited by the distance at which the eyes are apart.
Now the object glasses or lenses of the improved construction hereinafter described
enables the maximum diameter of the present objectives to be increased within
much wider limits than hitherto.

page_text: In carrying out my invention I take object lenses, either achromatized or not, of
a diameter larger than the distance between the eyes, and I cut their edges in the
shape of a segment of a circle and at such a distance from the centre that, if the
two lenses be moved nearer to each other along the line of the cut, the centres of
the lenses will be separated from each other by a space equal to that at which the
eyes are placed apart.
By this means I obtain an arrangement such as that shown diagrammatically in
the accompanying drawing.
It will be understood that I have done away with only a small portion of the
edges of the lenses and, by so doing, have realized all the advantages resulting
from the employment of large object glasses, without resorting to any complicated
construction.
Notwithstanding the slight deformation of the optical field, its value may be
augmented, or the clearness or magnifying power may be increased in any desired
proportions. Any existing oculars or eye pieces may be employed in connection
with these improved object lenses without requiring any alteration.
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 :-
Improved object lenses for binocular telescopes enabling the present maximum
limit of diameter of object glasses to be largely extended; the improvement
consisting in taking large object glasses and making a notch at the edge of
each in the form of a segment of a circle; such notch enabling the centres of
the glasses to be brought nearer to each other, so that the distance between
them may equal the distance between the eyes, or that they may be placed
at any other distance less than the diameters of the lenses or glasses, as herein-
above specified.
Dated this 16th da
1000
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.