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Preclassification System for the Wyandotte-ASTM Punched Cards, Indexing Spectral Absorption Data

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Once that the number of Wyandotte-ASTM punched cards indexing spectral absorption data exceeded several thousand, it was necessary to use a more rapid method in order to obtain a reasonable speed of retrieval. A preclassification of the total deck is described which needs no other special equipment than a card sorting machine. With this method 2,836 cards must be handled in the most unfavorable case instead of the 42,000 representing the authors' collection.

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370265789619944

Affiliations: Analytical Department, Labofina S.A., Centre de Recherches du Groupe Petrofina, Brussels 12, Belgium

Publication date: May 1, 1965

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