IBM 80 Column Card Gauge
Images
Front of the card gauge
Back of the card gauge
A punched card positioned in the card gauge
A punched card positioned in the card gauge showing the alignment of markings on the gauge to punches on the card.
Detail of the card gauge show the bottom column numbers and instructions saying "Gauge card face up".
Detail of the card gauge showing protrusions which register the card on the gauge in the rop right corner.
Detail of the card gauge show the labels reading "IBM" and "Made in U.S.A.".
Detail of the card gauge showing individual row and column numbers printed. The black rectangle should align exactly behind a punched hole.