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HISTORY OF

TRACT 20.

computers of logarithms, many others have also publishedtables ot those artificial numbers, more or less complete, andsometimes improved and varied in the manner and form ofthem. We may here just advert to a few of the principal ofthese.

In 1626, D. Henrion published, at Paris, a treatise concern-ing Brigg’s logarithms of common numbers, from 1 to 20000,to eleven places of figures; with the sines and tangents toeight places only.

In 1631, was printed, at London , by one George Miller, abook containing Briggs’s logarithms, with their differences,to ten places of figures besides the index, for all numbers to100000; as also the logarithmic sines, tangents, and secants,for every minute of the quadrant; with the explanation anduses in English .

The same year, 1631, Richard Norwood published bis• £ Trigonometriain which we find Briggs’s logarithms forall numbers to 10000, and for the sines, tangents, and secants,to every minute, both to seven places besides the index.—Inthe conclusion of the trigonometry, lie complains of the un-fair practices of printing Vlacq’s book in 1627 or 1628, andthe book mentioned in the last article. His words are, “ Now,whereas I have here, and in sundry places in this book, citedMr. Briggs his ‘ Arithmetica Logarithmica,’ (lest I may seemto abuse the reader) you are to understand not the book putforth about a month since in English , as a translation of his,and with the same title ; being nothing like his, nor worthyhis name; but the book which himself put forth with this titlein Latin, being printed at London anno 1624. And here Ihave just occasion to blame the ill dealing of these men, bothin the matter before mentioned, and in printing a second edi-tion of his 1 Arithmetica Logarithmica’ in Latin , whilst helived, against his mind and liking; and brought them over tosell, when the first were unsold; so frustrating those additionswhich Mr. Briggs intended in his second edition, and more-over leaving out some things that were in the first edition, ofspecial moment: a practice of very ill consequence, and