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Mother of pearl opera glasses and leather case. Opera glasses with handle, ca.1910. Opera glasses, also known as theater binoculars or Galilean binoculars, are compact, low-power optical magnification devices, usually used at performance events, whose name is derived from traditional use of binoculars at opera performances.
Binoculars housings can be made of various structural materials. Old binoculars barrels and hinge bridges were often made of brass. Later steel and relatively light metals like aluminum and magnesium alloys were used, as well as polymers like (fibre-reinforced) polycarbonate and acrylonitrile butadiene styrene. The housing can be rubber armored ...
A View-Master reel holds 14 film transparencies in seven pairs that create the seven stereoscopic images. The components of each pair are viewed simultaneously, one by each eye, thus simulating binocular depth perception. According to a 1960 court document, the Gruber-Sawyer partner venture began from that first meeting in 1938.
A typical stereoscope provides each eye with a lens that makes the image seen through it appear larger and more distant and usually also shifts its apparent horizontal position, so that for a person with normal binocular depth perception the edges of the two images seemingly fuse into one "stereo window". In current practice, the images are ...
A thaumatrope is an optical toy that was popular in the 19th century. A disk with a picture on each side is attached to two pieces of string. When the strings are twirled quickly between the fingers the two pictures appear to blend into one.
Here's everything you should know to be in the right place at the right time and spot the comet.. When and where to see Comet A3. The bad news: The comet is dimming.
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