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Mathematical Treasure: John Caswell’s Trigonometry

Author(s): 
Cynthia J. Huffman (Pittsburg State University)

Title page of John Caswell's 1685 trigonometry textbook.

Englishman John Caswell wrote a book with the title A Brief (but full) Account of the Doctrine of Trigonometry, Both Plain and Spherical, which was published in 1685. Caswell was a student of John Wallis and held the Savilian Chair of Astronomy at Oxford from 1709 to 1712.

The page below shows the first page, which contains a list of symbols that Caswell uses in this trigonometry textbook. Some, but not all, of the symbols are still in use today.

First page of John Caswell's 1685 trigonometry textbook.

A complete digital scan of Caswell’s Trigonometry  is available in the Linda Hall Library Digital Collections. The call number is QA33 .W343 1685

Images in this article are courtesy of the Linda Hall Library of Science, Engineering & Technology and used with permission. The images may be downloaded and used for the purposes of research, teaching, and private study, provided the Linda Hall Library of Science, Engineering & Technology is credited as the source. For other uses, check out the LHL Image Rights and Reproductions policy.

Index of Mathematical Treasures

Cynthia J. Huffman (Pittsburg State University), "Mathematical Treasure: John Caswell’s Trigonometry ," Convergence (July 2017)

Dummy View - NOT TO BE DELETED

Mathematical Treasures: The Linda Hall Library