Punched Cards as Position Indicators for Spectrographic Plates

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Rapid location of the significant regions on spectrographic plates by use of templates or position indicators can speed up plate measurements considerably. Punch cards for computer use provide a basic grid of 960 positions over a 7.0-in. ×2.9-in. area, and in several designs the 12 rows and 80 columns are legibly numbered. Holes in a punch card serve not only to indicate position, but can also be used as windows for photometric measurements if the card is used as a mask directly on the uncoated side of the plate.

Document Type: Short Communication

DOI: http://dx.doi.org/10.1366/000370268774383237

Affiliations: Applied Research Laboratory, United States Steel Corporation, Monroeville, Pennsylvania 15146

Publication date: July 1, 1968

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