General Information

Serial #

N/A

Part Number

1

Total Parts

1

AKA

N/A

Patents

N/A

General Description

glass

Dimensions

Note: These reflect the general size for storage and are not necessarily representative of the object's true dimensions.

Length

25.2 cm

Width

20.3 cm

Height

N/A

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Physics

Category

Light & electromagnetic radiation

Sub-Category

N/A

Manufacturer

AKA

Advanced

Country

United States of America

State/Province

Massachusetts

City

Cambridge

Context

Country

Canada

State/Province

Ontario

Period

late 1980s

Canada

Unknown

Function

A medium which presents a three dimensional image, in this case of a refraction grating (vertical bands designed to separate the spectrum).

Technical

An example of a reflection type hologram, designed to be lit from the front to reveal the image. The theory of holography was developed in 1947 by British/Hungarian scientist Dr. Dennis Gabor while working to improve the resolution of electron microscopes. In 1960 the laser was invented and its pure white light was ideal for holography. In 1962 Emmett Leith and Juris Upatnieks of the University of Michigan, combined Gabor's theory with their own work in side-reading radar and applied it to holography, resulting in the off-axis technique of hologram production still in use & the first laser transmission hologram. Also in 1962 Dr. Yuri N. Denisyuk of the U.S.S.R combined holography with Gabriel Lippmann's work in natural colour photography to produce a white-light reflection hologram which, for the first time, could be viewed in light from an ordinary incandescent light bulb. By 1965 Leith, Upatnieks & other U.S. researchers had developed off-axis reflection holograms (Ref. 1).

Area Notes

Unknown

Details

Markings

handwritten black lettering on edger reads "AERG, Inc", "FRONT TOWARD LIGHT" & "1987"

Missing

appears complete

Finish

colourless transparent glass

Decoration

N/A