12 Nov
2016
12 Nov
'16
11:24 a.m.
On Nov 11, 2016, at 7:16 PM, jim stephens <jwsmail
at jwsss.com> wrote:
...
Hollerith card info (via Wikipedia)
Card size is exactly 7 3?8 by 3 1?4 inches (187.325 mm ? 82.55 mm). The cards are made
of smooth stock, 0.007 inches (180 ?m) thick. There are about 143 cards to
the inch (56/cm).
I found another description of the specs in an old card reader/punch peripheral manual.
It also lists weight (0.534 lbs per 100 cards). It gives tolerances (length +/- 0.005
inch, width +0.007, -0.003, angle between the sides 90 degrees +/- 5 minutes, sides
straight +/- 0.003 inches). And, very interesting, it mentions that the orientation of
the paper fibers shall be parallel to the long side.
There are lots of paper manufacturers and lots of grades and thickness of paper. The
thickness we're talking about is one that shows up in a couple I looked at. So it
wouldn't surprise me at all if suitable paper could be had. The matter of cutting it
to the correct shape is a different issue, admittedly.
paul