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No public IJR answers mention John Napier yet. As people ask about it and share their answers, they'll appear here.
Not who you're looking for? Others named John Napier: Scottish mathematician, physicist, and astronomer (1550–1617 · British primatologist, paleoanthropologist, and physician (1 · English clergyman and cricketer (1859-1939) · British set and costume designer
“If a first sine be multiplied into a second producing a third, the Logarithm of the first added to the Logarithm of the second produces the Logarithm of the third. So in division, the Logarithm of the divisor subtracted from the Logarithm of the dividend leaves the Logarithm of the quotient.”
“And if any number of equals to a first sine be multiplied together producing a second, just so many equals to the Logarithm of the first added together produce the Logarithm of the second.”
“Any desired geometrical mean between two sines has for its Logarithm the corresponding arithmetical mean between the Logarithms of the sines.”
“From every line of his descent talent seems to have flowed in upon John Napier.”
“You have then (kind Reader) in this little book most amply unfolded the theory of the construction of logarithms, (here called by him artificial numbers, for he had this treatise written out beside him several years before the word Logarithm was invented,) in which their nature, characteristics, and various relations to their natural numbers, are clearly demonstrated.”
“In 1563, the year of his mother's death, John was sent to the University of St. Andrews, the mother university of Scotland. He was only thirteen, but this was the usual age at which lads then entered the universities.”
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