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Max The Magnificent
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re: Running around in ever-decreasing circles...
Max The Magnificent   6/24/2011 3:26:38 PM
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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
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re: Running around in ever-decreasing circles...
KarlS   6/24/2011 2:59:54 PM
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Read the last line of the email, Magnificent One.

Max The Magnificent
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re: Running around in ever-decreasing circles...
Max The Magnificent   6/24/2011 1:56:42 PM
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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
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re: Running around in ever-decreasing circles...
KarlS   6/24/2011 1:54:11 PM
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"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.



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