Microfiche
The microfiche is one of most compact among the memory supports Analogique S usually used. It is used in general in the institutions (as for example the college libraries) which cannot have space necessary to the storage of the paper documents correspondents. She was invented in 1961 by Carl O. Carlson, an employee of NCR and her patent granted in 1965.
Each microfiche contains from 100 to 130 pages approximately according to the size of the original. A collection of 20 000 microfiches, is of 10 000 with 20 000 pounds, holds in a piece of furniture of 1,5 X 0,5 X 2 meters. Certain companies specialize in the supplies of such collections.
The microfiche is normally used to reproduce perodic books, sometimes and newspapers. Its most current form is a transparent plastic card from approximately 10 out of 15 cm. The title of the work is usually readable with the naked eye on its stringcourse. The format of reduction more the current is of 24x, with 7 lines of 14 sights of pages on each microfiche. Certain microfiches have a numerical system of indexing marked on the edge of the card or each image, but this information is not used as well for the use of the microfiche itself as to automated systems of research.
The microfiche is not use as widespread as the Microfilm.
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