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Types of Microfilming

Aperture Cards
Aperture Cards

What is an Aperture Card? Aperture cards have developed from the old IBM80 column punch cards. They are basically a piece of card that is normally 82.5mm x 187mm in size with an area of the card dedicated to one frame of 35mm microfilm. Traditionally aperture cards have been used to store the microfilm copy of large engineering drawings and maps.

source: microfilm.com
Microfiche
Microfiche

Microform images are commonly reduced to about one twenty-fifth of the original document size. For special purposes, greater optical reductions may be used. All microform images may be provided as positives or negatives, more often the latter.

Microfilm
Microfilm

Microfilm: A film bearing a photographic record on a reduced scale of printed or other graphic matter. The long answer... Microfilming, also called microphotography, consists in the reduction of images to such a small size that they cannot be read without optical assistance.

image: wisegeek.org