5x8 inch index cards
This page gives access to the 5x8-inch cards used for field notes from visits to sites where the songs of crickets and katydids were recorded or specimens were collected. The original cards used for this purpose had 140 perforations around the edges. These would have allowed mechanical searching of the cards, by dropping from a deck of cards, those that shared specific holes that had been cut open to the card edge. A few years after adopting cards that permitted this “key-sort” system of searching, T.J. Walker realized that implementing such a system was impractical for his purposes. Thus in mid-1968, when the supply of perforated cards was exhausted, unperforated 5x8 cards were used instead. (The same data fields as had been printed on the the key-sort cards were printed on the plain cards.)
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Funding for collecting and organizing the Thomas J. Walker Collection was partially provided by Thomas J. Walker.