. Bell telephone magazine . To make a hologram, laser beams are mixed, then split into two beams: an illu-minating beam that shines directly onto the object, and a reference beam thatsreflected by a mirror onto photographic film. By shining a beam of light ontothe film, a three-dimensional multi-color image of the object is reproduced. Three conventional pictures of a single hologram photographic plate demonstrate the ability of asingle hologram to show three sides of a subject. When viewed against a yardstick, it is possibleto see the left side of the chess figures, the head-on view, and the
. Bell telephone magazine . To make a hologram, laser beams are mixed, then split into two beams: an illu-minating beam that shines directly onto the object, and a reference beam thatsreflected by a mirror onto photographic film. By shining a beam of light ontothe film, a three-dimensional multi-color image of the object is reproduced. Three conventional pictures of a single hologram photographic plate demonstrate the ability of asingle hologram to show three sides of a subject. When viewed against a yardstick, it is possibleto see the left side of the chess figures, the head-on view, and the right side of the ooking specks and whirls on the holographic plate (above) record thepattern produced by the interaction ol two laser beams. When illu-id by a beam of light (below), the original subject is recreated in a three)sional image which floats either before or behind the hologram. 1 I A L - i HHI^^^^^^^^E ■it— the hologram has other characteristics that make itattractive to scientists and engineers: ■ A hologram does not require any lens to producean image, ■ A hologram can produce multicolored imagesfrom film emulsions which normally produce onlyblack and white images, ■ A hologram can be broken into pieces, yet eachpiece can still produce the entire image, and ■ A single hologram can record information aboutmany different objects. The potential of the hologram technique is impliedin its name which is derived from the Greek rootsholo, meaning whole, and gram, meaning writ-ing or record. A holograms capability of storinglarge volumes of information in a compact area maymake it a p
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Keywords: ., bookauthoramerican, bookcentury1900, bookdecade1920, bookyear1922
