An Improvement in Binoculars.
Year: 1893

page_text: Date of Application, 19th July, 1893
Complete Specification Left, 23rd Nov., 1893-Accepted, 6th Jan., 1894
An Improvement in Binoculars.
HERBERT ANTHONY SAWYER Lieutenant-Colonel Indian Staff Corps, care of
Messrs. William Watson & Co. 27 Leadenhall Street London E.C. do hereby
declare the nature of this invention to be as follows:-
"
These extremely flat binoculars are made by cutting any sized "object lenses
down to the required flatness. The lenses are fixed in a flat rectangular case, the
movement of the " eye piece" being controlled by a spring, which as soon as
released causes the eye lenses to run out to the full extent. Adjustment to
required focus is made by the pressure of the thumb of the hand holding the
binoculars.
101 T1 1000
61
ני
H. A. SAWYER, Lt.-Col.,
c/o Messrs. W. Watson & Co., 27, Leadenhall Street,
COMPLETE SPECIFICATION.
An Improvement in Binoculars.
HERBERT ANTHONY SAWYER, Lieutenant-Colonel, Indian Staff Corps, care of
Messrs. William Watson and Co., 27 Leadenhall Street, London E.C., at present
residing at 40 Brompton Square, Brompton, in the County of Middlesex, 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:—
My invention relates to binocular glasses and its object is to facilitate their use
and transport. It consists essentially in making the upper and lower surfaces of
the case flat, and providing the case with means for the ready adjustment of the
eye-pieces and for the protection of the face of the user.
In order that my invention may be better understood reference is had to the
accompanying sheet of drawings upon which :-
Figure 1 illustrates a plan of a pair of binocular-field glasses constructed according
to my invention,
Figure 2 being a side elevation of the same,
Figure 3, a front or end view.
Figure 4 is a plan of the above, closed up.
Figure 5 is a plan illustrating the application of my spring slide to a pair of
ordinary binocular glasses.
Figure 6 shews the application of the invention to a monocular glass.
The case is formed of two rectangular tubes B B arranged within a shell C, or
united together by straps or metal plates. Between these tubes B B, and within
the shell C is arranged a cylindrical tube E within which is a spiral spring F for
operating a slide G, which is attached to or forms part of the eye-pieces a.
HH are finger-rings or handles which are pivotted or hinged to the shell C, and
I is a lever similarly attached to the slide G, and working within a slot in the
tube E. K is an elastic pad or cushion secured to the eye-pieces a of the glass.
The object-glasses A A are made of sections cut from the centre of lenses of
suitable curvature in approximately the section of the tubes B B, or consisting of
lentiform glasses of that shape.

page_text: By adopting this construction the glass can conveniently be slid into a belt or
pocket, and will rest with comparative steadiness on one hand when the other is
otherwise engaged, and the provision of the finger-rings H lever I and spiral
spring F, enables the same hand to effect the adjustment of the focus, and the
elastic pad or cushion K prevents injury to the face of the user through any
unsteadiness resulting from operating the glasses by one hand only.
When it is desired to use the glass-say with the left hand-the pivotted handles
or rings H are raised, and the first finger is then inserted within the rings H H, the
thumb being brought to bear upon the lever I which is connected to the slide G.
This movement of the slide G is communicated to the eye-piece a to which it is
attached. Pressure being exerted upon the lever I by the thumb causes the
eye-piece a to be moved until the required focus is obtained.
The finger-rings H may be hinged or otherwise attached to the underside of the
shell or casing which is of a rectangular section, the outer edges of which may
be slightly rounded if desired, the lever I being hinged or otherwise attached to
the slide G.
may make my case of metal or of any other suitable material, and the con-
struction may of course be applied to instruments baving one instead of two
object-glasses A A.
Instead of a strictly rectangular form the tubes B B may be made with curved
edges and the object-glasses may then be made of corresponding form.
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 :-
1. A case for binocular glasses, in which the tubes for securing the object lenses
are flat as described.
2. In telescopic glasses the use of a spiral spring F for actuating the eye-pieces
for the purpose of adjusting the focus of the glasses as described.
3. In telescopic glasses the finger-ring or rings H H in combination with the
lever I, and the spring F for holding the glasses and adjusting the eye-pieces as
described.
4. In telescopic glasses the use of one or more elastic pads K for the protection
of the face of the user as described.
5. In telescopic glasses, the use in substitution for complete lenses, of sections or
portions of lenses cut from the centre, or of lentiform glasses made in the form of
such portions as described.
6. Telescopic glasses constructed, combined and arranged as described and
illustrated on Figures 1 to 5 of the accompanying drawings.
Dated this Twenty-third day of November 1893.