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Unlike some other reproductions of classic texts (1) We have not
used OCR(Optical Character Recognition), as this leads to bad
quality books with introduced typos. (2) In books where there are
images such as portraits, maps, sketches etc We have endeavoured to
keep the quality of these images, so they represent accurately the
original artefact. Although occasionally there may be certain
imperfections with these old texts, we feel they deserve to be made
available for future generations to enjoy.
Unlike some other reproductions of classic texts (1) We have not
used OCR(Optical Character Recognition), as this leads to bad
quality books with introduced typos. (2) In books where there are
images such as portraits, maps, sketches etc We have endeavoured to
keep the quality of these images, so they represent accurately the
original artefact. Although occasionally there may be certain
imperfections with these old texts, we feel they deserve to be made
available for future generations to enjoy.
Prior to the advent of computers, no mathematician, physicist or
engineer could do without a volume of tables of logarithmic and
trigonometric functions. These tables made possible certain
calculations which would otherwise be impossible. Unfortunately,
carelessness and lazy plagiarism meant that the tables often
contained serious errors. Those prepared by Charles Hutton (1737
1823) were notable for their reliability and remained the standard
for a century. Hutton had risen, by mathematical ability, hard work
and some luck, from humble beginnings to become a professor of
mathematics at the Royal Military Academy. His mathematical work
was distinguished by utility rather than originality, but his
contributions to the teaching of the subject were substantial. This
seventh edition was published in 1858 with additional material by
Olinthus Gregory (1774 1841). The preliminary matter will be of
interest to any modern-day reader who wishes to know how
calculation was done before the electronic computer.
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![Letters On the Evidences, Doctrines, and Duties, of the Christian Religion [Addressed to a Friend] (Hardcover): Olinthus Gregory](http://media.loot.co.za/images/x80/69835191601179215.jpg)
