14 CATALOGUE OF SCIKN riFIC BOOKS. 



The As .': an Abridged Treatise on 



the Docimaslic Examination of Ores an 1 .\i\-\ <>t)ur Artificial 



Product*. Hy BRUNO KERL. Translated by Y- Ml 65 



illustrations, 8vo, cloth, 12s. &/. 



its Theory, Sources, and Applications. 



I. T. SPRAGUE, ' Sccon.l edition, revised and enlarged, 



numerous illustrations, crown 8vo, cloth, 15*. 



Tke Practice of Hand Turning in //'W, Iror\\ Shell, 



Turning such Work in Mrt.nl as maybe rr, )U irr.l 



in the Practice of Tumi: i, Ivory, etc.: also an Appnidix on 



Ornamental Turning. (A book for beginners.) By FRANCIS CAMTIN. 

 Third edition, with wood engravings, crown 8vo, cloth, 6s. 



CONTENTS : 



On Lathes Turning Toob Turning Wood Drilling Screw Cutting Miscellaneous 

 : cular Forms Staining Polishing Spinning Metals 

 ah Ornamental Turning, etc. 



Treatise on Watchwork, Past and Present. By the 



Rev. H. L. NELTHROPP, M.A., F.S.A. With 32 illustrations, c: 

 8vo, cloth, 6s. &/. 



CONTENTS : 



Definitions of Words and Terms used in Watchwork Tools- Time Historical Sum- 

 maryOn Calculations of the Numbers for Wheels and Pinions ; their Proportion.. 



,! Wheels, or Motion Work Length of Time of (ioiiiR without Winding 

 up The Verge The Horizontal The Duplex The Lever The Chronometer Relating 

 Watches Keyless Watches The Pendulum, or Spiral Spring Compensation Jew 



.les Clerkenwcll Fallacies of the Trade Incapacity of Workmen How to Choose 

 and Use a Watch, etc. 



Algebra Self-Taught. By W. P. HIGGS, M.A.. 



D.Sc., LL.D., Assoc. Inst C.E., Aulhor of ' A Handbook of the 1 

 ential Calculus,' etc. Second edition, crown 8vo, cloth, 2s. 6J. 



CONTENTS : 



Symbols and the Signs of Operation The Equation and the Unknown Q 



snd Negative Ouantities Multiplication Involution Expom 

 ncn t> Roots, and the Use of Exponents as Logarithms Logarithms Tables 

 and Proportionate Parts Transformation of System of Logarithms Common I 

 Common Logarithms Compound Multiplication and the P.inomial Theorem I 

 Fractions, and Ratio Continued Proportion The Series and the Summation of the 

 Limit of Scries Square and Cube Roots Equations List of Formula. 



Spons Dictionary of Engineering, Civil, MccJianical, 



Military, and Naval; with technical terms in French, German, Italian, 

 and Spanish, 3100 pp., and nearly 8000 en^ra^in^s, in supcr-roy:-,! 

 in 8 divisions, $/. 8/. Complete in 3 vols., cloth, 5/. $s. Hound in a 

 superior manner, half-morocco, top edge gilt, 3 vol.?., 67. \2s. 



