An Elementary Treatise on Plane and Spherical Trigonometry: With Their Applications to Navigation, Surveying, Heights and Distances, and Spherical Astronomy, and Particularly Adapted to Explaining the Construction of Bowditch's Navigator and the Nautical

Excerpt from An Elementary Treatise on Plane and Spherical Trigonometry: With Their Applications to Navigation, Surveying, Heights and Distances, and Spherical Astronomy, and Particularly Adapted to Explaining the Construction of Bowditch's Navigator and the Nautical Almanac

The first three parts of this treatise, comprising Plane Trigono metry, Navigation and Surveying, and Spherical Trigonometry, have been revised for the present edition, under the direction of the author. Some sections have been rewritten, and some additions have been made, but in all essential respects the book remains un altered. The original numbering of the formulas has been preserved and in the few cases in which the numbering of the sections has been changed, that of the former editions has been speedily restored.

In the Spherical Astronomy, the notation of the chapter on Eclipses has been conformed to that used in the American Ephemeris and Nautical Almanac.

The tables of the Navigator referred to in the first three parts of the work may be found, with a very few exceptions of slight im portance, in Bowditch's Useful Tables, a convenient selection from the Navigator, published by Messrs. E. And G. W. Blunt, New York. The only necessary tables, indeed, in this portion of the book, are those of logarithms of numbers, of logarithmic sines &c., of meridional parts, and of the correction for the middle latitude.

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