What is Microfilm?
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A continuous roll of photographic film used for storing miniaturized text and / or microimages in a linear array which can be magnified and copied only with the aid of a reader-printer machine. Some back files of periodicals are routinely converted to a roll of microfilm to save space. Reader / printer machines are available in the Library for viewing and making hard copies. A fine grain, high resolution photographic film used specifically for the capture of document images. Microfilm is manufactured primarily in either 16 mm or 35 mm widths and in 100 or 215 foot long rolls. While all camera microfilm has a silver halide photosensitive emulsion layer and this type of film is also used for the production of working duplicates, several highly economical duplication films exist such as diazo film (organic dyes) and vesicular film (bubbles). |
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