Breaking News
Comments
Newest First | Oldest First | Threaded View
Max The Magnificent
User Rank
Blogger
re: Running around in ever-decreasing circles…
Max The Magnificent   6/24/2011 3:26:38 PM
NO RATINGS
Oh, I see, you're suggesting building a simple one of these -- that would be cool -- I have a pile of un-punched cards in my office :-)

KarlS
User Rank
Rookie
re: Running around in ever-decreasing circles…
KarlS   6/24/2011 2:59:54 PM
NO RATINGS
Read the last line of the email, Magnificent One.

Max The Magnificent
User Rank
Blogger
re: Running around in ever-decreasing circles…
Max The Magnificent   6/24/2011 1:56:42 PM
NO RATINGS
Thanks for your reply -- but the actual question was whether there were any posters or educational games that could be used to explain this stuff to kids...

KarlS
User Rank
Rookie
re: Running around in ever-decreasing circles…
KarlS   6/24/2011 1:54:11 PM
NO RATINGS
"how punched cards were used" The first use was in tabulating the census of 1910, I think that was the year. They were invented by James(?) Hollerith. I am looking at a punched card right now. The card was divided into rows and columns. There were 80 columns and I think 12 rows, the top 3 rows were called zones and indicated how the remaining rows were encoded. Each column could be a letter(A - Z) or decimal number/(0 - 9). There are 26 letters so each zone punch along with one of the lower 9 was one of 9 letters -- 3 zones times one of 9 lower rows covered the 26 letters. I think this is accurate, no punch was zero and a punch in a lower row was 1 - 8. The cards were read by having a spring loaded contact that would fall through the hole so that whichever made contact that would be the meaning of the punched hole.



Most Recent Comments
rick merritt
 
MeasurementBlues
 
vvc0
 
zeeglen
 
Max The Magnificent
 
Max The Magnificent
 
vvc0
 
Max The Magnificent
 
arno_x
Flash Poll
Top Comments of the Week
Like Us on Facebook
EE Times on Twitter
EE Times Twitter Feed

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
EE Life
Frankenstein's Fix, Teardowns, Sideshows, Design Contests, Reader Content & More
Max Maxfield

Energizing the Young Engineers of Tomorrow
Max Maxfield
16 comments
It doesn't seem all that long ago when I was a bright-eyed, bushy-tailed young engineer. Now I feel like an old fool, but where are we going to find one at this time of the day (LOL)?

Jolt Judges and Andrew Binstock

Jolt Awards: The Best Books
Jolt Judges and Andrew Binstock
1 Comment
As we do every year, Dr. Dobb's recognizes the best books of the last 12 months via the Jolt Awards -- our cycle of product awards given out every two months in each of six categories. No ...

Engineering Investigations

Air Conditioner Falls From Window, Still Works
Engineering Investigations
2 comments
It's autumn in New England. The leaves are turning to red, orange, and gold, my roses are in their second bloom, and it's time to remove the air conditioner from the window. On September ...

David Blaza

The Other Tesla
David Blaza
5 comments
I find myself going to Kickstarter and Indiegogo on a regular basis these days because they have become real innovation marketplaces. As far as I'm concerned, this is where a lot of cool ...