[GreenKeys] [External] Re: OT: New coffee-table book on punched cards

[Jones, Douglas W]

On Feb 12, 2020, at 5:27 PM, Jim Haynes wrote:

> Which reminds me of the technology of "aperture cards" where a microfilm
> image was fitted into a card.  So they could use card sorters to sort the
> cards.

You mean like this?
-- https://homepage.divms.uiowa.edu/~jones/cards/blindex/RacalMilgoAperture.jpg

It's in the book, along with some others that have film in the aperture.  This is, however, the only one I have with the funny sawtooth notches on the bottom.

		Doug Jones
		jones at cs.uiowa.edu