Aperture card
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An aperture card is a punched card with a cut-out window into which a chip of microfilm is mounted. The card is typically punched with machine-readable metadata associated with the microfilm image, an
A backlit aperture card showing hollerith holes and the microform image, with the label "Register of deeds. Waukesha County, Wisconsin"
Ronald Kay, chief executive of UCCA, is seen holding an aperture card. The cards held a microfilm image of a candidate's applications to UK universities, and were used to print batches of applications sorted by the university and course applied to.
Edge-notched card
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Edge-notched cards or edge-punched cards are a system used to store a small amount of binary or logical data on paper index cards, encoded via the presence or absence of notches in the edges of the ca
Aperture card
…associated with the microfilm image, and printed across the top of the card for visual identification; it may also be punched by hand in the form of an edge-notched card. Information about the drawing, for example the drawing number, could be both punched and printed on the remainder of the card. With the proper machinery…
Edge-notched card used as a library card. Edges not notched here.
McBee Keysort card (1932 – 1980s): front and rear, with instructional diagram on rear
Hand tool for notching cards.
Keysort cards used in World War II codebreaking