An Improvement in Field, Marine, and Opera Glasses.
Year: 1889

page_text: Date of Application, 27th Mar., 1889
Complete Specification Left. 27th Dec., 1889-Accepted, 1st Feb., 1890
PROVISIONAL SPECIFICATION.
An Improvement in Field, Marine, and Opera Glasses.
We SAMUEL JOSEPH LEVI (Optician) and ERNEST CARRÉ (Clerk) both of
40 Furnival Street, Holborn, London do hereby declare the nature of this invention to
be as follows :—
Our invention relates to an improved focussing motion for field, marine, and opera
glasses; and it has for its object to enable the glass to be more quickly and easily
adjusted which is of importance especially when, as in the case of a horse race, the
object viewed is in rapid motion and its distance from the observer is therefore
constantly and quickly varying.
The invention consists in substituting for the ordinary screw motion, a motion
worked by a wheel or, preferably, a pair of wheels turning on a transverse axis at
right angles to the line of motion of the central sliding spindle and of such diameter
as to be readily worked by the pressure of the thumbs when the instrument is beld
by both hands, as race glasses are usually held. Each wheel acts on the sliding
spindle through a pin or stud projecting laterally from the sliding spindle through a
longitudinal slot in its guide tube, the said pin or stud engaging in a radial slot in
the inner face of the wheel. Or instead of a slot, each wheel may have a crank pin
fixed to its inner face, the said crank pin being connected with the stud on the
sliding spindle by a short connecting link. Instead of wheels, small levers may be
used.
Dated this 27th day of Mazah 1080
COMPLETE SPECIFICATION.
An Improvement in Field, Marine, and Opera Glasses.
We, SAMUEL JOSEPH LEVI (Optician) and ERNEST CARRE (Clerk) both of
40, Furnival Street, Holborn, London, 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 relates to an improved focussing motion for binocular field,
marine, and opera glasses; and it has for its object to enable the glass to be more
quickly and easily adjusted, which is of importance especially when, as in a horse-
race, the object viewed is in rapid motion and its distance from the observer is
constantly and quickly varying.
Reference is to be had to the accompanying drawings, forming part of this
specification, wherein figure 1 is a longitudinal section through the guide tube of
the central guide spindle of a binocular field glass, and figure 2 is a cross-section.
Figure 3 shews an inside face view of one of the wheels. Figure 4 is a longitudinal
section through the guide tube of the central spindle, shewing a modification, drawn
to a larger scale. The same letters of reference indicate like parts in all the
figures.
A is the central guide spindle and B the tube in which it slides for the purpose
of maintaining the parallelism of motion of the two telescopically-sliding members of
the optical tubes CC in the operation of focussing.
The Invention consists in substituting for the ordinary screw motion, a motion
worked by a wheel or preferably a pair of wheels D D turning on a transverse

page_text: axis dat right angles to the line of motion of the central sliding guide spindle A,
the wheel or wheels D being of such diameter as to be readily worked by the
pressure of the thumbs when the instrument is held by both hands, as shewn in
dotted lines in figure 2, which is the way in which race glasses are usually held.
The wheels Daretfast on the axis and turn together as one, each wheel acting
on the sliding spindle through a pin or stud a projecting laterally from opposite
sides of the sliding spindle A through longitudinal slots in its guide tube B, each
end of the said pin or stud a either engaging in a radial slot e in the inner face
of the corresponding wheel, as in figures 1, 2, and 3, or being connected by a short
connecting link with a crank ping fixed on the corresponding wheel, as in figure 4.
It is not absolutely necessary that the pin should be connected with both wheels,
when a pair of wheels are employed, although this is the best form. The pin may
project from the spindle at one side only and engage with a slot in one of the
wheels, the other wheel being plain. Instead of complete wheels D they may, as
the range of motion is limited; be mere segments or levers.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, we declare that what
we claim is ;
1. In a binocular field, marine, or opera glass, the herein described focussing
motion consisting of one or a pair of wheels segments or levers rotating on a
transverse axis and connected with the central guide spindle by a lateral pin on the
sliding spindle working in a longitudinal slot in the guide tube and in a radial slot
in the wheel, substantially as described.
2. In a binocular field, marine, or opera glass, the herein described focussing
motion, consisting of one or a pair of wheels segments or levers rotating on 'a
transverse axis and connected with the central guide spindle by a connecting link
attached to a crank pin on the wheel and to a laterally-projecting pin on the guide
spindle working in a longitudinal slot in the guide tube, substantially as specified.
Dated this 27th day of December 1900
S. J. LEVI.
E. CARRÉ.
By A. M. & Wm. Clark,
53, Chancery Lane, London, Patent Agents.