File:BabbageKeyValueCard.tiff
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BabbageKeyValueCard.tiff (461 × 246 pixels, file size: 24 KB, MIME type: image/tiff)
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Summary
DescriptionBabbageKeyValueCard.tiff |
English: Tabular data card proposed for Charles Babbage's w:Analytical Engine, from page 121 of Babbage's Passages from the Life of a Philosopher. The rectangular punched card has two numeric fields, 2303 and 3622939 and would have represented one entry in a table of logarithms. Note that .3622939 is the base 10 logarithm of 2.303. As Babbage explained it, the cards comprising tables of special functions, such as logarithms, would be initially punched by the Analytic Engine. When the computer subsequently needed a logarithm, it would stop, ring a bell and display the number whose log was required. An attendant would retrieve that number's card and place it in the engine. The engine would then check that the correct card was loaded and "continually ringing a loud bell" if not. Babbage also observed that it might turn out to be be faster for the engine to compute special functions when needed rather than resort to tables. |
Date | |
Source | https://ia801408.us.archive.org/0/items/passagesfromlif01babbgoog/passagesfromlif01babbgoog.pdf, https://en.wikisource.org/wiki/Page:Babbage_-_Passages_from_the_Life_of_a_Philosopher.djvu/139 |
Author | Charles Babbage |
Licensing
Public domainPublic domainfalsefalse |
This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 100 years or fewer. You must also include a United States public domain tag to indicate why this work is in the public domain in the United States. | |
This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. |
https://creativecommons.org/publicdomain/mark/1.0/PDMCreative Commons Public Domain Mark 1.0falsefalse
Items portrayed in this file
depicts
1864
image/tiff
0b822b266a52acdb904b001f94722d540dd9b86b
25,068 byte
246 pixel
461 pixel
File history
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 23:26, 19 September 2015 | 461 × 246 (24 KB) | ArnoldReinhold | Crisper image | |
02:59, 17 September 2015 | 603 × 320 (83 KB) | ArnoldReinhold | {{Information |Description ={{en|1=Table card proposed for Charles Babbage's w:Analytical Engine. From page 121 of Babbage's ''Reflections from the Life of a Philosopher''.}} |Source =https://ia801408.us.archive.org/0/items/passagesfroml... |
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Width | 461 px |
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Height | 246 px |
Compression scheme | LZW |
Pixel composition | RGB |
Orientation | Normal |
Number of components | 4 |
Number of rows per strip | 71 |
Data arrangement | chunky format |
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