Improvements in Collapsable Opera, Field, and such like Glasses.
Year: 1891

page_text: Date of Application, 7th Apr., 1891
Complete Specification Left, 6th Feb., 1892—Accepted, 26th Mar., 1892
PROVISIONAL SPECIFICATION..
Improvements in Collapsable Opera, Field, and such like Glasses.
I, CAROLINE SPILSBURY Pocock of No. 2 The Elms, St. Ann's Hill
Wandsworth, Gentlewoman and I, ALFRED WILLMER POCOCK of No. 2 The
Elms St. Ann's Hill Wandsworth Engineer do hereby declare the nature of this
invention to be as follows:-
1. Making the flexible portions of the bodies of collapsible opera, field and such
like glasses of a corrugated or bellows like form with the corrugations parallel to
each other and at right angles to the axis of the body, each corrugation having a
ring of wire inside to retain the shape.
2. Making the flexible portions of the bodies aforesaid of a corrugated form such
corrugations forming a continuous spiral or screw around the axis of the body and
having inside a continuous spiral wire to retain the shape, which wire may or may
not act as a spring to extend the glasses.
3. Making a swivel connection of one or both ends of the flexible portions of the
bodies aforesaid to the plates of the frames of the glasses when the spiral form
aforesaid is used so as to admit of the necessary turning movement caused by such
spiral form on opening and closing the glasses.
4. Attaching to the top. plate of such glasses which carries the eye lenses a
spindle having a rack cut on it which rack gears with a pinion carried on a middle
plate and which spindle works in a tube attached to the middle plate, such parts
being used for adjusting the focus of the glasses.
5. Making this spindle work in a tube which also has a rack cut upon it for part
of its length which said tube works in the aforesaid tube, attached to the middle
plate and which tube has a moveable stop in it which regulates the movements of
the spindle and rackwork tube when worked by the aforesaid pinion and which
causes the spindle and rackwork tube to open and close in succession when worked
upon by the pinion.
6. Attaching the top plate containing the eye lenses to the focussing spindle by
one or more small screws which pass through a slotted hole or holes in this plate
and screw into another plate securely attached to the spindle, thus admitting of the
adjustinent of the eye lenses to the object lenses at any time. The slotted holes
may be made in the plate attached to the spindle & the screws screwed with the
top plate.
7. Making the stops upon the arms of the frames of collapsible opera & such
like glasses or some of them to abut against adjustable screws working in fixed
portions of the frames so that the stops can at any time be readily adjusted by
means of these screws.
8. Applying to the arms or other portions of the frames one or more stretcher
bars for the purpose of fixing the glasses open & so making them more rigid when
in use.
9. Attaching the flexible parts of the bodies direct to the top and bottom plates
of the frames and allowing them to pass freely through the middle plate.
Dated this 6th day of April 1891.
CAROLINE SPILSBURY POCOCK.
ALFD. WILLMER POCOCK.

page_text: COMPLETE SPECIFICATION.
Improvements in Collapsable Opera, Field, and such like Glasses.
I, CAROLINE SPILSBURY Pocock of No. 2 The Elms St. Ann's Hill
Wandsworth Surrey Gentlewoman and, 1, ALFRED WILLMER POCOCK of the
same address. 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:—
Our invention consists in
1. Making the flexible portions of the bodies of collapsible opera field and such
like glasses of a corrugated or bellows like form with the corrugations parallel to
each other and at right angles to the axis of the body, each corrugation having a
ring of wire inside it to retain its shape.
2. Making the flexible portions aforesaid of a corrugated form, such corrugations
forming a continuous spiral or screw around the axis of the body and having inside
a wire to retain the shape, such wire being also a continuous spiral and which wire
may or may not act as a spring to extend the glasses.
3. Making a swivel connection of one or both ends of the flexible portions of the
bodies aforesaid to the plates of the frames of the glasses when the spiral form is
used so as to admit of the necessary turning movement caused by such spiral form
on opening and closing the glasses.
4. Attaching to the top plate of such glasses which carries the eye lenses a
spindle having a rack cut upon it which rack gears with a pinion carried on a
middle plate & which spindle works in a tube attached to the middle plate, such
parts being used for adjusting the focus of the glasses.
5. Attaching the top plate containing the eye lenses in collapsible opera field &
such like glasses to the focussing spindle by one or more small screws which pass
through a slotted hole or slotted holes in this plate and screw into another plate
which is securely attached to the spindle, thus permitting of the adjustment of the
eye lenses to the object lenses as to collimation at any time. These slotted holes
may be made in the plate attached to the spindle and the screws screwed into the
top plate.
6. Making the stops upon the arms of the frames of collapsible opera, field &
such like glasses or some of them to abut against adjustable screws working in fixed
portions of the frames so that the stops can at any time be readily adjusted by
means of these screws.
7. Applying to the arms or other portions of the frames of collapsible opera,
field & such like glasses one or more stretcher bars for the purpose of fixing the
glasses open & so making them more rigid when in use.
8. Attaching the flexible portions of the bodies of collapsible opera, field &
such like glasses to the top and bottom plates of the frames and allowing them to
pass freely through the middle plate.
And in order that our said invention may be particularly described and explained
reference is made to the accompanying drawings in which similar letters of reference
indicate like parts and in which drawings the application of our invention to
collapsible opera field & like glasses is illustrated.
Fig. 1. is a half elevation and half sectional view of an opera glass fully
extended.
Fig. 2. is a plan of same glass closed.
A. A. are the flexible portions of the body which by preference we make of
leather, made in the spiral form and having a spiral wire inside to retain their
shape. This wire may or may not act as a spring to keep the glasses extended.
In the case illustrated the flexible parts are securely attached to the bottom
plate of the glasses but are attached to the top plate by a swivel joint so as to
admit of the partial turning round of this flexible part on the opening and closing of
the glasser,

page_text: The mode of fixing is as follows, viz., B is a flanged collar screwed on the inside
to fit the outside of the tube of the cell D. C is another flanged collar bored to
fit on the plain neck of the collar B. E is 'the top plate of the glasses which carries
the eye pieces and in which openings are made sufficiently large for the necks or
pipes of the collars C to turn in. The neck or pipe of the collar B is somewhat
shorter than the length of the collar C and the neck or pipe of this collar C is
somewhat longer than the thickness of the plate E. The flexible material of the
body which is shown by a strong black line in the section, is turned over upon the
flange of the collar B. The collar C is then placed over the neck of the collar B.
The plate E being now placed upon the collar C the cell D is tightly screwed
into B thus clamping up the flexible material between the flanges of B and C but
allowing sufficient play for the whole to turn in the plate E.
For the focussing adjustment H is a spindle having a rack cut upon it and
working in the tube L. This rack is moved by the pinion F which gears into it,
the pinion being moved by the user of the instrument by the milled head I.
For adjusting the eye lenses in collimation with the objective lenses the plate E
is fastened to the plate J by screws K, K passing through slots in E and screwing
into J. The plate J is securely attached to the spindle H.
are
In order that the instrument may be rigid when open the various arms
provided with stop pieces to abut against certain portions of the frame. Instead
of letting these stops abut directly against the frame we screw into that part of the
frame against which the stop would abut a screw for the stop to abut against and
by screwing this screw in or out in its seating the position of the stop can be readily
adjusted.
In the case illustrated N. N¹ are stops on the spindles carrying the lower
arms M. M M M and these stops abut when the glass is open against the
adjustable screws O. O' in the bottom plate of the frame.
P is the stretcher bar attached to the arm M³ and is provided with a projecting
pin at its free end which, when the glass is open is inserted into the hole S in the
joint of the arm M. When the glass is closed this bar is laid along the arm M³,
the projecting pin being inserted in a hole at the lower end of that arm.
The flexible portions of the bodies are attached to the top and bottom plates and
pass freely through the middle plate R.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is:
1. Making the flexible portions of the bodies of collapsible opera field & such
like glasses of a corrugated or bellows like form having the corrugations parallel to
each other and at right angles to the axis of the body and having a ring of wire
inside cach corrugation to retain it in shape.
2. Making the flexible portions aforesaid of a corrugated form, such corrugations
forming a continuous spiral or screw around the axis of the body and having inside
a wire to retain the shape, such wire being also a continuous spiral and which wire
may or may not act as a spring to extend the glasses.
3. Making a swivel connection of one or both ends of the flexible portions of the
bodies aforesaid to the plates of the frames of the glasses.
4. Attaching to the top plate of collapsible opera field & such like glasses a
spindle having a rack cut upon it which rack is worked by a pinion for focussing
the glasses.
5. Attaching the top plate carrying the eye pieces in collapsible opera, field &
such like glasses to the focussing spindle by one or more screws which pass through
slotted holes in the top plate and screw into the focussing spindle or a plate securely
attached to it.
6. Making the stops upon the arms of the frames of collapsible opera field & like
glasses or some of them to abut against adjustable screws in fixed portions of the
frame,

page_text: 7. Applying to the arms or frames of collapsible opera field & such like glasses
one or more stretcher bars for fixing the glasses open.
8. Attaching the flexible portions of the bodies of collapsible opera field & like
glasses to the top and bottom plates of the frames and allowing them to pass freely
through the middle plates.
All substantially as described herein and illustrated by the drawings.
1
1
ג
2002
CAROLINE SPILSBURY POCOCK.
ALFD. WILLMER POCOCK.