Business Forms Ruler: Relic of a Lost Age of Computing

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Business form rulers were widely used throughout the 20th Century to help lay out various documents commonly found in an office environment. This example, from the 1960s or 70s, has an unusual quirk: it is designed to measure punch cards, a once-ubiquitous medium for data entry and processing that dominated the Information Age for nearly a century.

SOURCES:

https://blog.startled.com/post/526537...
https://americanhistory.si.edu/collec...
https://www.computerhistory.org/stora...
http://www.columbia.edu/cu/computingh...
https://www.gfierheller.ca/wp-content...
https://web.archive.org/web/200608301...
https://whatis.techtarget.com/referen...
http://bitsavers.org/pdf/ibm/punchedC...
https://www.ibm.com/ibm/history/ibm10...
https://web.archive.org/web/200704080...
http://www.quadibloc.com/comp/cardint...