Abstract
TODHUNTER's “Trigonometry” is a very familiar friend of ours, and we have now before us a bundle of letters which we received from the author in 1861 and 1862, in reply to our criticisms and corrections of the early editions. The first edition swarmed with small errata, for the pointing out of which we received warm thanks. It was a good book for some years, on account of the excellent collection of problems, but of late it sadly wanted bringing up to date. Mr. Hogg has done his work well, but possibly he would have produced a better independent book. The first 200 pages have undergone very little change, and we have only noted here and there an interpolated article. Chapter xviii., “Miscellaneous Propositions,” contains several novelties (as contrasted with the last edition we have of the original work), such as geometrical proofs of familiar formulæ and graphs of the trigonometrical functions. There are numerous important additions in chapters xxi.-xxiv., which bring this part of the work more en rapport with present day requirements, notably Schlömilch's resolution of sin θ into factors, and a too brief account of hyperbolic functions. The prime feature is the addition of a very great number of excellent recent exercises in all parts of the subject. The work forms a good school-book, and will meet the requirements of a large number of students.
Plane Trigonometry for the Use of Colleges and Schools.
With numerous Examples. By I. Todhunter. Revised by R. W. Hogg. (London: Macmillan and Co., 1891.)
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Plane Trigonometry for the Use of Colleges and Schools. Nature 44, 342 (1891). https://doi.org/10.1038/044342a0
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DOI: https://doi.org/10.1038/044342a0