Improvements in the Construction of Monocular and Binocular Opera, Field, and Marine Glasses and the like.
Year: 1896

page_text: Date of Application, 6th Nov., 1896
Complete Specification Left, 26th Feb., 1897-Accepted, 24th Apr., 1897
Improvements in the Construction of Monocular and Binocular
Opera, Field, and Marine Glasses and the like.
1, JAMES AITCHISON, of 47 Fleet Street, London E.C. Optician do hereby
declare the nature of my said invention to be as follows:-
The object of my invention is to effect improvements in that class of opera or
other glass for which Letters Patent were granted No. 1016 of 1891, and consists
in rendering such glasses more portable, lighter and more conveniently carried than
hitherto.
According to my invention, dispense with the barrels and connect the two
frames, carrying the lenses, in such a manner that the frames are always parallel
with each other and the axes of the lenses always coincide.
This I effect, preferably, by four arms suitably bent or shaped so as not to
interfere with the line of sight and geared or otherwise connected at the joints in
such a manner as to insure the parallelism of the frames and arranged so that one
pair of arms balance the other."
Dated 6th November 1896.
GEO.
DOWNING,
8 Quality Court, London, W.C., Agent.
Improvements in the Construction of Monocular and Binocular
Opera, Field, and Marine Glasses and the like.
I, JAMES AITCHISON of 47 Fleet Street, London E.C. Optician, do hereby
declare the nature of my said invention and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement:-
The object of my invention is to effect. improvements in that gluss of opera or
other glasses, for which Letters Patent were granted, No. 1016 of 1891, and
consists in rendering such glasses more portable, lighter, and more conveniently
carried than hitherto.
According to my invention, 1 dispense with the barrels, and connect the two
frames, carrying the lenses, in such a manner that the frames are always parallel
with each other, and the axes of the lenses always coincide. This I effect,
preferably, by four arms suitably bent or shaped so as not to interfere with the line
of sight, and geared or otherwise connected at the joints in such a manner as to
ensure the parallelism of the frames, and arranged so that one pair of arms balance
the other.
And in order that my said invention may be particularly described and
ascertained, reference is hereby made to the accompanying drawings, in which
similar figures of reference indicate corresponding parts.

page_text: Fig. 1 is an elevation of my improved opera glass, showing the frames placed
some distance apart.
Fig. 2 is a plan view of the glass, in a closed position.
Fig. 3 is an end view, showing the frames apart, as in Fig. 1.
Fig. 4 is an enlarged plan view of one of the parallel motion gear cases.
Fig. 5 is a similar view, the cover being removed to show the gear.
Fig. 6 is a similar view of the lower plate and toothed slide.
7 is the frame fitted with the eye lenses, and 8 is the frame fitted with the object
glasses. 9, 9, are two arms pivoted at 10, 10, to two other arms 11, 11, so as to
move freely in the ring pivots 10, 10.
The arms 9 and 11 are bent, as shown in Figs. 2 and 3, so as to be clear of the
focus and line of sight. The ends of the arms 9 and 11, where they enter the gear
cases 12 and 13, are integral with slotted discs, engaging with a vertical tooth
attached to a sliding plate, as shown in Figs. 5 and 6. The gear cases being
similar, it will be sufficient to describe the case 12
The lower plate 14 of the case 12 carries two cylindrical studs 15, 15, which are
bored and screw threaded to receive the screws 20, 20.
The lower plate 14 of the case 12 carries two cylindrical studs 15, 15, which are
hored and screw threaded to receive the screws 2020. The plate 14 is grooved
to receive the sliding plate 16, and this sliding plate carries a vertical stud or
tooth 17. The ends of the levers or arms 9, 9, are formed with forked
dises 18, 19, as shown in Fig. 5, the forked dises being pivoted upon the
studs 15, and formed so as to simultaneously engage the tooth 17, whereby
simultaneity of motion and angularity is secured to the arms. 20, 20, are screws
which pass through the top cover plate of the gear case and enter the studs 15,
thus securing the gear, and enabling the opera glass to be opened and closed as
required.
By means of obvious modifications my invention is applicable to monocular and
other glasses. Also toothed or any other suitable gear may be substituted for that
shown in connection with the gear cases 12 and 13.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed 1 declare that what I
claim is :-
1. The improvements in the construction of monocular and binocular opera, field,
and marine glasses, and the like, substantially as herein. before described and
illustrated by the drawings.
2. In monocular, binocular, and other glasses as aforesaid, the combination
therewith of parallel motion bars, arms, or links 9 and 11, severally and together
operating substantially as herein before described and illustrated by the drawings.
3. In monocular, binocular, and other glasses as aforesaid, the combination
therewith of pivoted arms, having forked pivoted discs, geared together by
means of a tooth or stud integral with a sliding plate, substantially as and for the
purposes herein before described aud illustrated by the drawings.
Dated 26th February 1897.
GEO.
DOWNING,
8 Quality Court, London, W.C., Agent.