File:A page from Mirifici logarithmorum canonis descriptio.jpg
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A page from ''Mirifici logarithmorum canonis descriptio'' by John Napier
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| Description |
עברית: עמוד מספרו של ג'ון נפייר Mirifici logarithmorum canonis descriptio משנת 1614
English: A page from Mirifici logarithmorum canonis descriptio by John Napier. The left-most column gives minutes to be added to the angle for this page, 34 degrees. The far right column is the co-angle (90° - x). This page covers 30 to 60 minutes; a facing page covers 0 to 30 minutes.
Adjacent to each outer column is the sine of that angle, followed towards the middle by the absolute value of natural log of the sine. One can get cosines easily by reading across the page from the co-angle. In the middle column is the difference between the two logs, which is the natural log of the tangent function (cotangent if you reverse sign).[1] |
| Date | |
| Source | Google Books |
| Author | John Napier |
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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 70 years or fewer. This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929. |
| This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. | |
- ↑ Napier, John (1614) The Description of the Wonderful Canon of Logarithms, 17centurymaths.com
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