Improvements in the Construction of Prismatic Binoculars.
Year: 1899

page_text: Date of Application. 26th July, 1899
PROVISIONAL SPECIFICATION.
Improvements in the Construction of Prismatic Binoculars.
We, JoHN STUART, Managing Director of Ross, Limited, of 111, New Bond
Street, in the County of London, and JOHN HENRY BARTON, of 3, North Side,
Clapham Common, in the County of London, Optician's Assistant, do hereby
declare the nature of this invention to be as follows:-
The
The object of this invention is to construct prismatic binoculars in such a
manner as to be very compact and rigid and so that they can be economically and
readily manufactured and adjusted. According to this invention the body parts
of the instrument are connected by means of arms which are affixed to the end
plates of the body parts, one of the arms being affixed to each of the plates at
each end and with the projecting ends of the said arms constituting a pair at
front and back overlapping, or engaged, together, and secured so as to be capable
of moving as upon a hinge for altering the distance between the eye pieces.
said arms at one, or both, of the ends of the instrument can be attached in the
first instance to the plates by means which will allow of the slight movement
necessary for adjustment for obtaining coincident images and when this is done
they are finally fixed. As this adjustment is only necessary at one end the arms
at the other end of the instrument can if desired be formed in one with the end
plates. The movement for focussing the two eye pieces simultaneously can be
done by means of a screw and milled head or equivalent device at the centre on
which the arms are hinged and connected by arms to the tubes of the eye pieces.
Dated this 26th day of July 1899.
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C., Agents.
Improvements in the Construction of Prismatic Binoculars.
We, JOHN STUART, Managing Director of Ross, Limited, of 111, New Bond
Street, in the County of London, and Joux HENRY BARTON, of 3, North Side,
Clapham Common, in the County of London, Optician's Assistant, do hereby
declare the nature of this invention and in what manner the same is to be per-
formed to be particularly described and ascertained in and by the following
statement:-
The object of this invention is to construct prismatic binoculars in such a
manner as to be very compact and rigid and so that they can be economically and
readily manufactured and adjusted. According to this invention the body parts

page_text: of the instrument are connected by means of arms which are affixed (by being
made in one therewith, or by fastening thereto by screws, or otherwise,) to the
end plates of the body parts, one of the arms being so affixed to each of the plates
at each end of the instrument, and with the projecting ends of the said arms
constituting a pair at front and back, overlapping, or engaging, together, or
otherwise so connected, or secured, together, as to be capable of moving as upon
a hinge for altering the distance between the eye pieces. In order to allow of
the slight relative movement of the body parts necessary for adjustment for
obtaining coincident images and as it would be difficult to adjust the prisms
for this purpose we prefer that the said arms, or one of them, at one, or at both,
of the ends of the instrument should be made separately from the plate or plates,
and be attached in the first instance to the plate, or plates, by means which will
allow of the said movement and, when coincident images have, by this adjustment
been obtained, the said arm, or arms, is, or are, firmly fixed to the plate or plates.
When such adjustment is to be provided for it is only necessary to provide for
it at one end of the instrument and therefore the arms, or one of the arms, at
one end of the said instrument, only need be attached to allow of adjustment,
the arms which do not require to be adjustable being, if desired, formed in one
with the end plates.
In order that this invention may be well understood we will describe, with refer-
ence to the accompanying drawing, a construction in accordance therewith in
which the arms at one end are affixed to the end plates so as to allow of adjust-
ment, but it is to be understood that the arrangement at each end may be such
as to allow of adjustment for obtaining coincident images, or not, as may be
desired. Figure 1 is a plan and Figures 2 and 3 are views of the opposite
ends. a are the body parts of the instrument and are the end plates to which
the aforesaid arms c (of any suitable shape and size) are affixed. The said arms c,
at the eye-piece end, are shewn as being formed in one with the end plates b
whilst the arms c, at the object glass end, are shewn as being provided with
extensions (of any suitable shape and size) secured by screws to the end
plates.
By making the clearing holes for the screws in the extensions larger than
is actually necessary for the passage of the screws through them the aforesaid
adjustment for the obtaining coincidence of the images can be made the said
extensions being not clamped quite tightly against the end plates b, the screws d
being left somewhat loose; the adjustment can then be made by a slight move-
ment of the bodies relatively to each other (such slight movement being allowed
by reason of the enlarged clearing holes aforesaid in the extensions () and as
soon as the adjustment satisfactory the screws d are tightened so that the arms
are practically as rigidly secured to the plates as if they were in one therewith,
but if thought desirable, additional screws or steadying pins may be placed in
the extensions engaging with the end plates after the adjustment has been
made and the screws d tightened up.
The outer ends of each of the arms forming a pair at each end of the instrument
are shewn as being recessed and engaged together and centered at e so that they
can be turned, as on a hinge, for altering the distance between the eye pieces.
The movement for focussing of the two eye-pieces can be done by turning the
eye-piece carriers f on the tubes g as shewn, or the eye-pieces can be adjusted
simultaneously by means of a screw and milled head or equivalent device, at
the centre on which the arms are hinged and connected by arms to the tubes
of the eye pieces.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed we declare that what we
claim is:
1. A prismatic binocular having the body parts connected by arins affixed to
the end plates (by being made in one therewith, or secured thereto, by screws, or

page_text: otherwise;) and connected in pairs at each end so as to be capable of being turned
as upon a hinge for adjustment of the distance apart of the eye pieces; substan-
tially as herein before described.
2. A prismatic binocular having the body parts connected by arms, affixed to
the end plates as aforesaid and connected in pairs at each end so as to be capable
of being turned, as upon a hinge for adjustment of the distance apart of the
eye pieces, one, or more, of the said arms, being so affixed to the end plate, or
plates, as to allow of adjustment for obtaining coincident images; substantially
as hereinbefore described.
Dated this 15th day of Fol 190A
JOHNSONS & WILLCOX.
47, Lincoln's Inn Fields, London, W.C., Agents.