"Napier and Briggs conferred with each other and agreed to modify the original logarithms of Napier. In the Appendix to Napier's posthumous work, the Constructio, an improvement is suggested, "which adopts a cypher as the Logarithm of unity, and 10,000,000,000 as the Logarithm of either one tenth of unity or ten times unity." The subsequent use of decimal fractions in logarithmic tables led to the common logarithm proper, in which \log 1 = 0 and \log 10 = 1. A readjustment of Napier's original logarithms was made in 's New Logarithmes, published in 1619 in London, whereby the logarithms virtually became the so-called "s" of to-day."
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History of logarithms
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