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

[Jim Haynes]

On Wed, 12 Feb 2020, Nick England wrote:

> Another use for punch cards (circa 1968) - cut one up into a size to fit a
> 35mm slide holder, sandwiched with a piece of blank film. Paint transparent

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.