Improvements in Orthoptics.
Year: 1891

page_text: Date of Application, 29th May, 1891
Complete Specification Left, 29th Feb., 1892-Accepted, 23rd Apr.,
1892
PROVISIONAL SPECIFICATION.
Improvements in Orthoptics.
1,JAMES BAXTER, of 1 Faraday Place, Addiewell, West Calder, Mid-Lothian,
Engineer, do hereby declare the nature of this invention to be as follows:
This invention relates to orthoptics for use by riflemen and others.
The improved orthoptics are preferably made as usual with spectacles or goggles
having one eye fitted cither with clear glass or without glass and the other eye
covered with a blackened or other opaque disc in which an opening is cut, which
opening is covered by a revolving shutter having, preferably, four sight holes in
it of different sizes. The shutter is or may be revolved by means of a small
knob or equivalent passing through from the outside of the opaque disc.
To enable the disc to be adjusted to different angles to suit the inclination
of the head of the rifleman, it is, preferably, hinged to the spectacle frame by
means of a small bracket, carrying a vertical spindle which may have a screw
for tightening it up and thus retaining the disc in the adjusted position. There
is also preferably, fitted to the hinge a second screw and spindle or equivalent
for adjusting the angle of elevation of the disc. The disc may be allowed to
fall, by gravity, into the proper position before being screwed or clamped in
position.
Instead of having a hinge, a ball and socket or other universal or equivalent,
suitable joint may be used.
There may be fitted to the orthoptic a graduated quadrant and a movable
finger or similar device for indicating the angle of adjustment. The shutter
may also have graduations on it to determine or aid in determining the proper
position and to enable it to be set.
My improved orthoptic has the advantages over others of being easily and
readily adjusted to any desired position or angle and it can, if necessary, be easily
retained in such adjusted position.
Dated this 28th day of May 1891.
H. D. FITZPATRICK,
London and Glasgow, Agent.
COMPLETE SPECIFICATION.
Improvements in Orthoptics.
JAMES BAXTER, of 1 Faraday Place, Addiewell, West Calder, Mid-Lothian,
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:-
This invention rates to orthoptics, for use by riflemen and others.
And in order that my said invention may be properly understood, I have
hereunto appended in explanatory sheet of drawings, whereon:-
Fig. 1 is a back-view of the orthoptics.

page_text: three, four or other number of sight holes d of different sizes. On the drawing 1
have shown three sight holes.
To enable the disc e to be adjusted to different angles, to suit the inclination of
the head of the rifleman, it is, preferably secured to the spectacle frame by means
of a small bracket e, carrying a vertical spindle f, screwed at its upper end and has
on its lower end jaws h, in which is carried a second horizontal spindle i, screwed
at its outer end. To this horizontal spindle, between the jaws h, is fitted, hinge-
wise, the bar j, which is pinned at its lower end to the centre of the disc c.
pink for securing the bar, may have a small handle on its outer end, for enabling
the disc to be easily manipulated.
The
Working on the screwed spindle is a nut g. By screwing the nut down against
the bracket e, the disc c can, when adjusted to any desired angle to the frame, be
clamped and retained in position. Fig. 5 shows the disc thus clamped at an
angle.
Working on the screwed spindle i is a nut 1, with a long sleeve l' on it.
When
the nut is screwed up, it clainps the disc in any desired position, at an inclination
to the frame. The disc may be allowed to fall, by gravity, into the proper
inclination, before being screwed or clamped in position. Fig. 4 shows the disc as
in two positions, the outer position being represented by the dotted lines.
Instead of having a hinge, a ball and socket or other universal or equivalent
suitable joint may be used.
The disc c and appurtenances can be fitted to the bracket e' for persons shooting
with their left eye open.
The disc may have but a single opening d of large size and a revolving shutter,
with the openings of different sizes, be used to cover the opening in the disc.
My improved orthoptic has the advantages over others, of being easily and
readily adjusted to any desired position or angle, and it can, if necessary, be easily
retained in such adjusted position.
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 :-
Orthoptics, constructed substantially as herein before described and shown on the
drawings annexed, or any mere modification thereof.
Dated this 26th day of February 1892.
H. D. FITZPATRICK,
Glasgow and London, Agent.