Tables of logarithms

In 1625, De Decker entered a contract with Adriaan Vlacq

Adriaan Vlacq

Adriaan Vlacq was a Dutch book publisher and author of mathematical tables. Born in Gouda, Vlacq published a table of logarithms from 1 to 100,000 to 10 decimal places in 1628 in his Arithmetica logarithmica. This table extended Henry Briggs' original tables which only covered the values...

 for the publication of
several translations of books by John Napier

John Napier

John Napier of Merchiston – also signed as Neper, Nepair – named Marvellous Merchiston, was a Scottish mathematician, physicist, astronomer & astrologer, and also the 8th Laird of Merchistoun. He was the son of Sir Archibald Napier of Merchiston. John Napier is most renowned as the discoverer...

, Edmund Gunter

Edmund Gunter

Edmund Gunter , English mathematician, of Welsh descent, was born in Hertfordshire in 1581.He was educated at Westminster School, and in 1599 was elected a student of Christ Church, Oxford. He took orders, became a preacher in 1614, and in 1615 proceeded to the degree of bachelor in divinity...

 and Henry Briggs

Henry Briggs (mathematician)

Henry Briggs was an English mathematician notable for changing the original logarithms invented by John Napier into common logarithms, which are sometimes known as Briggsian logarithms in his honour....

. A first book was published in 1626, with several translations
done by Vlacq. A second book was made of the logarithms of the first 10000 numbers
from Briggs' Arithmetica logarithmica published in 1624. The logarithms were shortened
to 10 places. In 1627, De Decker's "Tweede deel" was published and it contained
the logarithms of all numbers from 1 to 100000, to 10 places. Only very few copies of
this book are known and its publication was apparently stopped or delayed.
In 1628, Vlacq's Arithmetica logarithmica was published and contained exactly
the tables published in 1627.

Publications

• Ezechiel de Decker: Eerste Deel van de Nieuwe Telkonst, 1626
• Ezechiel de Decker: Nieuwe Telkonst, 1626
• Ezechiel de Decker: Tweede Deel van de Nieuwe Tel-konst, 1627 (partial facsimile published in 1964)