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.)

                                                                           Choose a year:

1957

1958

1959

1960

1961

1962

1963

1964

1965

1966

1967

1968

1969

1970

1971

1972

1973

1974

1975

1976

1977

1978

 

Funding for collecting and organizing the Thomas J. Walker Collection was partially provided by Thomas J. Walker.