Improvements in Binocular Field and Opera Glasses.
Year: 1896

page_text: Date of Application, 1st May, 1896
Complete Specification Left, 29th Jan., 1897-Accepted, 20th Mar., 1997
Improvements in Binocular Field and Opera Glasses.
JAMES HENRY STEWARD 406 Strand London Optician do hereby declare the nature
of this invention to be as follows:--
The application of an improved mechanical arrangement for facilitating the rapid
use of field glasses, consisting of an improved focussing arrangement so constructed
that a curved slot is made in the outer tube of motion work and a pin or screw
inserted in the inner tube, the latter to move in the curved slot when the motion wheel
is turned. This is particularly convenient for use with binoculars for military and
sporting purposes where the lenses, or a supplemental lens, are made to travel between
the object glasses and the eye piece end within the body of the binocular and without
altering its length externally, whether viewing near or distant objects or employed by
long or short-sighted persons.
Impro
JAMES HENRY STEWARD 406 Strand London 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 application of an improved mechanical arrangement for facilitating the rapid
use of field, opera, and marine glasses consisting of an improved, focussing arrange-
ment so constructed that the change in the distance between the eye lenses and the
object glasses can be quickly made & with the employment of one hand only. This is
particularly convenient for use with binoculars for military or sporting purposes and
is especially useful in those instruments where the eye lenses travel up and down, or
a supplemental lens for focussing travels between the eye lens and the object glass
within the body of the binocular without altering its length externally.
Preference is given to the former system as superior results can be obtained and
the movement of the eye lenses need only be slight to suit long or short sights, or
when employed in viewing near objects such as one would require to see in a theatre,
or distant objects in the field.
In order that the improved motion may be more clearly understood I append a
drawing in line section showing the tubes and bar that carry the eye lenses and which
move up or down on turning an ordinary focussing wheel, the framework of binoculars
being shown by dotted lines. The focussing wheel A is fixed to a motion tube B
which is slotted somewhat as shown at C & a pin D is fitted to an under tube or rod
attached to bar E and which naturally rises up and down when the milled wheel A

page_text: is turned. To the bar E is attached tubes F. F carrying the eye lenses. These
tubes pass through sleeves K. K¹ at G. G¹ so as to ensure correct fitting and to
preserve the optical axes of the binocular.
The eye lenses H. H' fit into the tops of tubes F. F' at H. H¹. The object glasses
are fitted in cells at the bottom of frame at I. I".
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 :-
1. The improved motion work for binoculars by means of a pin in one tube or
rod, working in a slot in another tube substantially as figured and described.
2. An improved binocular opera, field or marine glass fitted with the improved
motion for the purpose as set forth and as figured and described.
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J. H. STEWARD.