[DOC] [TLE] Binoculars - Wikipedia [PAR] Binoculars or field glasses are binocular telescopes mounted side-by-side and 
aligned to point ... vary widely from opera glasses to large pedestal mounted 
military models. ... These are typically mounted on an eyeglass frame or custom-
fit onto .... intended to give the user the flexibility of having a single pair of 
binoculars... [DOC] [TLE] Opera glasses - The College of Optometrists [PAR] Opera Glasses preceded the pair of field binoculars in date and form a ... To see 
more detailed versions of these images, click on the respective thumbnails ... 
Optically, opera glasses can be classified as binocular versions of the Galilean 
telescope. ... frames to fix together the barrels of two identical ivory and gilt 
spyglasses. [DOC] [TLE] The History of Telescopes and Binoculars - University of Arizona [PAR] These telescopes and binoculars were not one-off instruments and the design ..... 
lenses in the Schyrle erecting system was mounted in each of the segments. .... 
or spyglasses into a pair of opera glasses by using a frame with two bridges [13]. [DOC] [TLE] Field glasses | Article about field glasses by The Free Dictionary [PAR] Binoculars, like telescopes, are classified according to magnification, angle of ... 
Prism binoculars are made with 3-power (opera glasses) to 22-power 
magnification. ... For persons who wear glasses, approximately one-third of the 
field of vision ... are a pair of Great War leather-bound German field glasses 
presented to Pte... [DOC] [TLE] military binoculars knowledge - to abecedarian and beginner [PAR] Other types of binocular include the opera glass and the field glass; both use 
Galilean ... A binoculars essentially consist of a pair of parallel telescopes joined 
at the ... These two most commonly types of prism systems have resulted in two 
basic ... With the prisms positioned one over the other, the objective lenses and 
the... [DOC] [TLE] binocular facts, information, pictures | Encyclopedia.com articles ... [PAR] It is assumed that these instruments were studied and perfected by Galileo Galilei
. Early binoculars were actually called binocular telescopes, and are thought to 
be ... The roof system uses prisms positioned one over the other resulting in a ... 
The focusing lenses are placed in the housing with screws mounted by hand. [DOC] [TLE] Class 351 - United States Patent and Trademark Office [PAR] Jul 10, 2012 ... Included also are these instruments combined with eye exercising and/or training 
devices. ... Single lenses or lens combinations are classified elsewhere, and are 
... binoculars and telescopes; subclasses 409+ for opera glass holders; ... Lenses 
usually mounted in spectacle frames, in eyeglass mountings... [DOC] [TLE] Patent US4659194 - Binocular focusing mechanism - Google Patents [PAR] A binocular focusing mechanism for a binocular having a pair of telescopes 
disposed ... generally parallel to the telescopes and is mounted between the 
telescopes in a ... The binocular as defined by claim 10 wherein one end of the 
knob includes a ... Conventional binoculars have utilized various different types 
of focusing... [DOC] [TLE] Full text of "Priced and illustrated catalogue of optical instruments ... [PAR] PEBBLES, Any of the foregoing frames fitted with pebbles, complete, per pair, . .... 
The object-glasses of all our Telescopes are achromatic, and of the best quality. 
.... The power and sharpness of definition of an Opera or Field Glass depends ..... 
All objects must be mounted in one of three ways : dry in Air, ditto in Balsam or... [DOC] [TLE] Patent US2002782 - Opera glass - Google Patenti [PAR] One object of the invention is to provide an opera glass of the ... Figure 9 is a 
perspective of the frame for the eye lenses; .... These apertures are aligned with 
the apertures 42 in the front wall I9 of the casing member and receive .... lenses 
mounted thereon connected pivotally to the rear ends of the side walls of one of 
the... [DOC] [TLE] Patent US6330401 - Camera and binocular preamplifier ... - Google [PAR] One optical system in the binoculars is positioned against the lens of a camera ... 
camera such as a disposable camera and a relatively small pair of binoculars. ... 
As disclosed in the patent, the combination binocular telescope and camera ... of 
these same

Question: Opera & field glasses are classified as these, a pair of telescopes mounted on a single frame
Answer: Binoculars