108 WORKS PUBLISHED BY ROBERT BALDWIN. 



- 9. A TREATISE on NAVIGATION and 



NAUTICAL ASTRONOMY, adapted to the Purposes of Ele- 

 mentary Instruction ; with an Extensive Series of Examples for 

 Exercise, and all the Tables requisite for Nautical Computations ; 

 with Rules and Examples adapted to the " Nautical Almanac" in 

 its New and Improved Form. By Edward Riddle, F.R.A.S., Master 

 of the Nautical School, Greenwich Hospital. The Fourth Edition, in 

 a large vol. 8vo, price 10s. Qd. boards ; or 125. bound. 



* ^* Dr. J. P. Dodd, of Trinity College, Dublin, in his "Lecture ou the Best 

 Means of Promoting the Intellectual Improvement of Youth," says of " Riddle's 

 Navigation" — "That admirable work contains both the Theory and Practice, being, 

 in fact, a neat little course of Mathematics. It would be well for the naval and 

 merchant services were it generally used in schools." 



10. TABLES of the LOGARITHMS of NUM- 



BERS, ajid of Sines, Tangents, and Secants, to Six Places of 

 Decimals. Extracted from Mr. Riddle's " Treatise on Navigation." 

 Price 2s. Qd, 



11. A PRACTICAL SYSTEM of ALGEBRA, 



designed for the Use qf Schools and Private Tuition. By Peter 

 Nicholson and J. Rowbotham. Fifth Edition, price 5s. bound. 



In this edition the authors have not only introduced some important 

 original matter, particularly on proportion, imaginary quantities, binomial theorem, 

 series, &c,, but have also endeavoured to illustrate many parts of the work by such 

 alterations as will make it still more acceptable to the public. 



12. A KEY to the above Work, containing the 



Solutions of more than 900 Problems, by the use of vt^hich, and the 

 Algebra, a person may acquire a knowledge of this valuable science 

 without the assistance of a Master. Price 8s. bound. i 



Just published, price 2s. 6^/., 



THE PRINCIPLE and LAW of RATING, to 



the Relief of the Poor, Railway, Gas, Water, and other similar Com- 

 panies ; founded upon judgments recently delivered in the Court of 

 Queen's Bench, and herein set forth ; with observations thereon, and 

 Forms and Tables for practically working out the same. By Charles 

 Penfold, Surveyor, &c., &c. 



